1 /* Functions related to building classes and their related objects.
2 Copyright (C) 1987, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
4 Contributed by Michael Tiemann (tiemann@cygnus.com)
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
13 GCC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING. If not, write to
20 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
21 Boston, MA 02110-1301, USA. */
24 /* High-level class interface. */
28 #include "coretypes.h"
39 #include "tree-dump.h"
41 /* The number of nested classes being processed. If we are not in the
42 scope of any class, this is zero. */
44 int current_class_depth;
46 /* In order to deal with nested classes, we keep a stack of classes.
47 The topmost entry is the innermost class, and is the entry at index
48 CURRENT_CLASS_DEPTH */
50 typedef struct class_stack_node {
51 /* The name of the class. */
54 /* The _TYPE node for the class. */
57 /* The access specifier pending for new declarations in the scope of
61 /* If were defining TYPE, the names used in this class. */
62 splay_tree names_used;
64 /* Nonzero if this class is no longer open, because of a call to
67 }* class_stack_node_t;
69 typedef struct vtbl_init_data_s
71 /* The base for which we're building initializers. */
73 /* The type of the most-derived type. */
75 /* The binfo for the dynamic type. This will be TYPE_BINFO (derived),
76 unless ctor_vtbl_p is true. */
78 /* The negative-index vtable initializers built up so far. These
79 are in order from least negative index to most negative index. */
81 /* The last (i.e., most negative) entry in INITS. */
83 /* The binfo for the virtual base for which we're building
84 vcall offset initializers. */
86 /* The functions in vbase for which we have already provided vcall
89 /* The vtable index of the next vcall or vbase offset. */
91 /* Nonzero if we are building the initializer for the primary
94 /* Nonzero if we are building the initializer for a construction
97 /* True when adding vcall offset entries to the vtable. False when
98 merely computing the indices. */
99 bool generate_vcall_entries;
102 /* The type of a function passed to walk_subobject_offsets. */
103 typedef int (*subobject_offset_fn) (tree, tree, splay_tree);
105 /* The stack itself. This is a dynamically resized array. The
106 number of elements allocated is CURRENT_CLASS_STACK_SIZE. */
107 static int current_class_stack_size;
108 static class_stack_node_t current_class_stack;
110 /* The size of the largest empty class seen in this translation unit. */
111 static GTY (()) tree sizeof_biggest_empty_class;
113 /* An array of all local classes present in this translation unit, in
114 declaration order. */
115 VEC(tree,gc) *local_classes;
117 static tree get_vfield_name (tree);
118 static void finish_struct_anon (tree);
119 static tree get_vtable_name (tree);
120 static tree get_basefndecls (tree, tree);
121 static int build_primary_vtable (tree, tree);
122 static int build_secondary_vtable (tree);
123 static void finish_vtbls (tree);
124 static void modify_vtable_entry (tree, tree, tree, tree, tree *);
125 static void finish_struct_bits (tree);
126 static int alter_access (tree, tree, tree);
127 static void handle_using_decl (tree, tree);
128 static tree dfs_modify_vtables (tree, void *);
129 static tree modify_all_vtables (tree, tree);
130 static void determine_primary_bases (tree);
131 static void finish_struct_methods (tree);
132 static void maybe_warn_about_overly_private_class (tree);
133 static int method_name_cmp (const void *, const void *);
134 static int resort_method_name_cmp (const void *, const void *);
135 static void add_implicitly_declared_members (tree, int, int);
136 static tree fixed_type_or_null (tree, int *, int *);
137 static tree resolve_address_of_overloaded_function (tree, tree, tsubst_flags_t,
139 static tree build_simple_base_path (tree expr, tree binfo);
140 static tree build_vtbl_ref_1 (tree, tree);
141 static tree build_vtbl_initializer (tree, tree, tree, tree, int *);
142 static int count_fields (tree);
143 static int add_fields_to_record_type (tree, struct sorted_fields_type*, int);
144 static void check_bitfield_decl (tree);
145 static void check_field_decl (tree, tree, int *, int *, int *);
146 static void check_field_decls (tree, tree *, int *, int *);
147 static tree *build_base_field (record_layout_info, tree, splay_tree, tree *);
148 static void build_base_fields (record_layout_info, splay_tree, tree *);
149 static void check_methods (tree);
150 static void remove_zero_width_bit_fields (tree);
151 static void check_bases (tree, int *, int *);
152 static void check_bases_and_members (tree);
153 static tree create_vtable_ptr (tree, tree *);
154 static void include_empty_classes (record_layout_info);
155 static void layout_class_type (tree, tree *);
156 static void fixup_pending_inline (tree);
157 static void fixup_inline_methods (tree);
158 static void propagate_binfo_offsets (tree, tree);
159 static void layout_virtual_bases (record_layout_info, splay_tree);
160 static void build_vbase_offset_vtbl_entries (tree, vtbl_init_data *);
161 static void add_vcall_offset_vtbl_entries_r (tree, vtbl_init_data *);
162 static void add_vcall_offset_vtbl_entries_1 (tree, vtbl_init_data *);
163 static void build_vcall_offset_vtbl_entries (tree, vtbl_init_data *);
164 static void add_vcall_offset (tree, tree, vtbl_init_data *);
165 static void layout_vtable_decl (tree, int);
166 static tree dfs_find_final_overrider_pre (tree, void *);
167 static tree dfs_find_final_overrider_post (tree, void *);
168 static tree find_final_overrider (tree, tree, tree);
169 static int make_new_vtable (tree, tree);
170 static int maybe_indent_hierarchy (FILE *, int, int);
171 static tree dump_class_hierarchy_r (FILE *, int, tree, tree, int);
172 static void dump_class_hierarchy (tree);
173 static void dump_class_hierarchy_1 (FILE *, int, tree);
174 static void dump_array (FILE *, tree);
175 static void dump_vtable (tree, tree, tree);
176 static void dump_vtt (tree, tree);
177 static void dump_thunk (FILE *, int, tree);
178 static tree build_vtable (tree, tree, tree);
179 static void initialize_vtable (tree, tree);
180 static void layout_nonempty_base_or_field (record_layout_info,
181 tree, tree, splay_tree);
182 static tree end_of_class (tree, int);
183 static bool layout_empty_base (tree, tree, splay_tree);
184 static void accumulate_vtbl_inits (tree, tree, tree, tree, tree);
185 static tree dfs_accumulate_vtbl_inits (tree, tree, tree, tree,
187 static void build_rtti_vtbl_entries (tree, vtbl_init_data *);
188 static void build_vcall_and_vbase_vtbl_entries (tree, vtbl_init_data *);
189 static void clone_constructors_and_destructors (tree);
190 static tree build_clone (tree, tree);
191 static void update_vtable_entry_for_fn (tree, tree, tree, tree *, unsigned);
192 static void build_ctor_vtbl_group (tree, tree);
193 static void build_vtt (tree);
194 static tree binfo_ctor_vtable (tree);
195 static tree *build_vtt_inits (tree, tree, tree *, tree *);
196 static tree dfs_build_secondary_vptr_vtt_inits (tree, void *);
197 static tree dfs_fixup_binfo_vtbls (tree, void *);
198 static int record_subobject_offset (tree, tree, splay_tree);
199 static int check_subobject_offset (tree, tree, splay_tree);
200 static int walk_subobject_offsets (tree, subobject_offset_fn,
201 tree, splay_tree, tree, int);
202 static void record_subobject_offsets (tree, tree, splay_tree, bool);
203 static int layout_conflict_p (tree, tree, splay_tree, int);
204 static int splay_tree_compare_integer_csts (splay_tree_key k1,
206 static void warn_about_ambiguous_bases (tree);
207 static bool type_requires_array_cookie (tree);
208 static bool contains_empty_class_p (tree);
209 static bool base_derived_from (tree, tree);
210 static int empty_base_at_nonzero_offset_p (tree, tree, splay_tree);
211 static tree end_of_base (tree);
212 static tree get_vcall_index (tree, tree);
214 /* Variables shared between class.c and call.c. */
216 #ifdef GATHER_STATISTICS
218 int n_vtable_entries = 0;
219 int n_vtable_searches = 0;
220 int n_vtable_elems = 0;
221 int n_convert_harshness = 0;
222 int n_compute_conversion_costs = 0;
223 int n_inner_fields_searched = 0;
226 /* Convert to or from a base subobject. EXPR is an expression of type
227 `A' or `A*', an expression of type `B' or `B*' is returned. To
228 convert A to a base B, CODE is PLUS_EXPR and BINFO is the binfo for
229 the B base instance within A. To convert base A to derived B, CODE
230 is MINUS_EXPR and BINFO is the binfo for the A instance within B.
231 In this latter case, A must not be a morally virtual base of B.
232 NONNULL is true if EXPR is known to be non-NULL (this is only
233 needed when EXPR is of pointer type). CV qualifiers are preserved
237 build_base_path (enum tree_code code,
242 tree v_binfo = NULL_TREE;
243 tree d_binfo = NULL_TREE;
247 tree null_test = NULL;
248 tree ptr_target_type;
250 int want_pointer = TREE_CODE (TREE_TYPE (expr)) == POINTER_TYPE;
251 bool has_empty = false;
254 if (expr == error_mark_node || binfo == error_mark_node || !binfo)
255 return error_mark_node;
257 for (probe = binfo; probe; probe = BINFO_INHERITANCE_CHAIN (probe))
260 if (is_empty_class (BINFO_TYPE (probe)))
262 if (!v_binfo && BINFO_VIRTUAL_P (probe))
266 probe = TYPE_MAIN_VARIANT (TREE_TYPE (expr));
268 probe = TYPE_MAIN_VARIANT (TREE_TYPE (probe));
270 gcc_assert ((code == MINUS_EXPR
271 && SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), probe))
272 || (code == PLUS_EXPR
273 && SAME_BINFO_TYPE_P (BINFO_TYPE (d_binfo), probe)));
275 if (binfo == d_binfo)
279 if (code == MINUS_EXPR && v_binfo)
281 error ("cannot convert from base %qT to derived type %qT via virtual base %qT",
282 BINFO_TYPE (binfo), BINFO_TYPE (d_binfo), BINFO_TYPE (v_binfo));
283 return error_mark_node;
287 /* This must happen before the call to save_expr. */
288 expr = build_unary_op (ADDR_EXPR, expr, 0);
290 offset = BINFO_OFFSET (binfo);
291 fixed_type_p = resolves_to_fixed_type_p (expr, &nonnull);
292 target_type = code == PLUS_EXPR ? BINFO_TYPE (binfo) : BINFO_TYPE (d_binfo);
294 /* Do we need to look in the vtable for the real offset? */
295 virtual_access = (v_binfo && fixed_type_p <= 0);
297 /* Do we need to check for a null pointer? */
298 if (want_pointer && !nonnull)
300 /* If we know the conversion will not actually change the value
301 of EXPR, then we can avoid testing the expression for NULL.
302 We have to avoid generating a COMPONENT_REF for a base class
303 field, because other parts of the compiler know that such
304 expressions are always non-NULL. */
305 if (!virtual_access && integer_zerop (offset))
306 return build_nop (build_pointer_type (target_type), expr);
307 null_test = error_mark_node;
310 /* Protect against multiple evaluation if necessary. */
311 if (TREE_SIDE_EFFECTS (expr) && (null_test || virtual_access))
312 expr = save_expr (expr);
314 /* Now that we've saved expr, build the real null test. */
317 tree zero = cp_convert (TREE_TYPE (expr), integer_zero_node);
318 null_test = fold_build2 (NE_EXPR, boolean_type_node,
322 /* If this is a simple base reference, express it as a COMPONENT_REF. */
323 if (code == PLUS_EXPR && !virtual_access
324 /* We don't build base fields for empty bases, and they aren't very
325 interesting to the optimizers anyway. */
328 expr = build_indirect_ref (expr, NULL);
329 expr = build_simple_base_path (expr, binfo);
331 expr = build_address (expr);
332 target_type = TREE_TYPE (expr);
338 /* Going via virtual base V_BINFO. We need the static offset
339 from V_BINFO to BINFO, and the dynamic offset from D_BINFO to
340 V_BINFO. That offset is an entry in D_BINFO's vtable. */
343 if (fixed_type_p < 0 && in_base_initializer)
345 /* In a base member initializer, we cannot rely on the
346 vtable being set up. We have to indirect via the
350 t = TREE_TYPE (TYPE_VFIELD (current_class_type));
351 t = build_pointer_type (t);
352 v_offset = convert (t, current_vtt_parm);
353 v_offset = build_indirect_ref (v_offset, NULL);
356 v_offset = build_vfield_ref (build_indirect_ref (expr, NULL),
357 TREE_TYPE (TREE_TYPE (expr)));
359 v_offset = build2 (PLUS_EXPR, TREE_TYPE (v_offset),
360 v_offset, BINFO_VPTR_FIELD (v_binfo));
361 v_offset = build1 (NOP_EXPR,
362 build_pointer_type (ptrdiff_type_node),
364 v_offset = build_indirect_ref (v_offset, NULL);
365 TREE_CONSTANT (v_offset) = 1;
366 TREE_INVARIANT (v_offset) = 1;
368 offset = convert_to_integer (ptrdiff_type_node,
370 BINFO_OFFSET (v_binfo)));
372 if (!integer_zerop (offset))
373 v_offset = build2 (code, ptrdiff_type_node, v_offset, offset);
375 if (fixed_type_p < 0)
376 /* Negative fixed_type_p means this is a constructor or destructor;
377 virtual base layout is fixed in in-charge [cd]tors, but not in
379 offset = build3 (COND_EXPR, ptrdiff_type_node,
380 build2 (EQ_EXPR, boolean_type_node,
381 current_in_charge_parm, integer_zero_node),
383 convert_to_integer (ptrdiff_type_node,
384 BINFO_OFFSET (binfo)));
389 target_type = cp_build_qualified_type
390 (target_type, cp_type_quals (TREE_TYPE (TREE_TYPE (expr))));
391 ptr_target_type = build_pointer_type (target_type);
393 target_type = ptr_target_type;
395 expr = build1 (NOP_EXPR, ptr_target_type, expr);
397 if (!integer_zerop (offset))
398 expr = build2 (code, ptr_target_type, expr, offset);
403 expr = build_indirect_ref (expr, NULL);
407 expr = fold_build3 (COND_EXPR, target_type, null_test, expr,
408 fold_build1 (NOP_EXPR, target_type,
414 /* Subroutine of build_base_path; EXPR and BINFO are as in that function.
415 Perform a derived-to-base conversion by recursively building up a
416 sequence of COMPONENT_REFs to the appropriate base fields. */
419 build_simple_base_path (tree expr, tree binfo)
421 tree type = BINFO_TYPE (binfo);
422 tree d_binfo = BINFO_INHERITANCE_CHAIN (binfo);
425 if (d_binfo == NULL_TREE)
429 gcc_assert (TYPE_MAIN_VARIANT (TREE_TYPE (expr)) == type);
431 /* Transform `(a, b).x' into `(*(a, &b)).x', `(a ? b : c).x'
432 into `(*(a ? &b : &c)).x', and so on. A COND_EXPR is only
433 an lvalue in the frontend; only _DECLs and _REFs are lvalues
435 temp = unary_complex_lvalue (ADDR_EXPR, expr);
437 expr = build_indirect_ref (temp, NULL);
443 expr = build_simple_base_path (expr, d_binfo);
445 for (field = TYPE_FIELDS (BINFO_TYPE (d_binfo));
446 field; field = TREE_CHAIN (field))
447 /* Is this the base field created by build_base_field? */
448 if (TREE_CODE (field) == FIELD_DECL
449 && DECL_FIELD_IS_BASE (field)
450 && TREE_TYPE (field) == type)
452 /* We don't use build_class_member_access_expr here, as that
453 has unnecessary checks, and more importantly results in
454 recursive calls to dfs_walk_once. */
455 int type_quals = cp_type_quals (TREE_TYPE (expr));
457 expr = build3 (COMPONENT_REF,
458 cp_build_qualified_type (type, type_quals),
459 expr, field, NULL_TREE);
460 expr = fold_if_not_in_template (expr);
462 /* Mark the expression const or volatile, as appropriate.
463 Even though we've dealt with the type above, we still have
464 to mark the expression itself. */
465 if (type_quals & TYPE_QUAL_CONST)
466 TREE_READONLY (expr) = 1;
467 if (type_quals & TYPE_QUAL_VOLATILE)
468 TREE_THIS_VOLATILE (expr) = 1;
473 /* Didn't find the base field?!? */
477 /* Convert OBJECT to the base TYPE. OBJECT is an expression whose
478 type is a class type or a pointer to a class type. In the former
479 case, TYPE is also a class type; in the latter it is another
480 pointer type. If CHECK_ACCESS is true, an error message is emitted
481 if TYPE is inaccessible. If OBJECT has pointer type, the value is
482 assumed to be non-NULL. */
485 convert_to_base (tree object, tree type, bool check_access, bool nonnull)
490 if (TYPE_PTR_P (TREE_TYPE (object)))
492 object_type = TREE_TYPE (TREE_TYPE (object));
493 type = TREE_TYPE (type);
496 object_type = TREE_TYPE (object);
498 binfo = lookup_base (object_type, type,
499 check_access ? ba_check : ba_unique,
501 if (!binfo || binfo == error_mark_node)
502 return error_mark_node;
504 return build_base_path (PLUS_EXPR, object, binfo, nonnull);
507 /* EXPR is an expression with unqualified class type. BASE is a base
508 binfo of that class type. Returns EXPR, converted to the BASE
509 type. This function assumes that EXPR is the most derived class;
510 therefore virtual bases can be found at their static offsets. */
513 convert_to_base_statically (tree expr, tree base)
517 expr_type = TREE_TYPE (expr);
518 if (!SAME_BINFO_TYPE_P (BINFO_TYPE (base), expr_type))
522 pointer_type = build_pointer_type (expr_type);
523 expr = build_unary_op (ADDR_EXPR, expr, /*noconvert=*/1);
524 if (!integer_zerop (BINFO_OFFSET (base)))
525 expr = build2 (PLUS_EXPR, pointer_type, expr,
526 build_nop (pointer_type, BINFO_OFFSET (base)));
527 expr = build_nop (build_pointer_type (BINFO_TYPE (base)), expr);
528 expr = build1 (INDIRECT_REF, BINFO_TYPE (base), expr);
536 build_vfield_ref (tree datum, tree type)
538 tree vfield, vcontext;
540 if (datum == error_mark_node)
541 return error_mark_node;
543 /* First, convert to the requested type. */
544 if (!same_type_ignoring_top_level_qualifiers_p (TREE_TYPE (datum), type))
545 datum = convert_to_base (datum, type, /*check_access=*/false,
548 /* Second, the requested type may not be the owner of its own vptr.
549 If not, convert to the base class that owns it. We cannot use
550 convert_to_base here, because VCONTEXT may appear more than once
551 in the inheritance hierarchy of TYPE, and thus direct conversion
552 between the types may be ambiguous. Following the path back up
553 one step at a time via primary bases avoids the problem. */
554 vfield = TYPE_VFIELD (type);
555 vcontext = DECL_CONTEXT (vfield);
556 while (!same_type_ignoring_top_level_qualifiers_p (vcontext, type))
558 datum = build_simple_base_path (datum, CLASSTYPE_PRIMARY_BINFO (type));
559 type = TREE_TYPE (datum);
562 return build3 (COMPONENT_REF, TREE_TYPE (vfield), datum, vfield, NULL_TREE);
565 /* Given an object INSTANCE, return an expression which yields the
566 vtable element corresponding to INDEX. There are many special
567 cases for INSTANCE which we take care of here, mainly to avoid
568 creating extra tree nodes when we don't have to. */
571 build_vtbl_ref_1 (tree instance, tree idx)
574 tree vtbl = NULL_TREE;
576 /* Try to figure out what a reference refers to, and
577 access its virtual function table directly. */
580 tree fixed_type = fixed_type_or_null (instance, NULL, &cdtorp);
582 tree basetype = non_reference (TREE_TYPE (instance));
584 if (fixed_type && !cdtorp)
586 tree binfo = lookup_base (fixed_type, basetype,
587 ba_unique | ba_quiet, NULL);
589 vtbl = unshare_expr (BINFO_VTABLE (binfo));
593 vtbl = build_vfield_ref (instance, basetype);
595 assemble_external (vtbl);
597 aref = build_array_ref (vtbl, idx);
598 TREE_CONSTANT (aref) |= TREE_CONSTANT (vtbl) && TREE_CONSTANT (idx);
599 TREE_INVARIANT (aref) = TREE_CONSTANT (aref);
605 build_vtbl_ref (tree instance, tree idx)
607 tree aref = build_vtbl_ref_1 (instance, idx);
612 /* Given a stable object pointer INSTANCE_PTR, return an expression which
613 yields a function pointer corresponding to vtable element INDEX. */
616 build_vfn_ref (tree instance_ptr, tree idx)
620 aref = build_vtbl_ref_1 (build_indirect_ref (instance_ptr, 0), idx);
622 /* When using function descriptors, the address of the
623 vtable entry is treated as a function pointer. */
624 if (TARGET_VTABLE_USES_DESCRIPTORS)
625 aref = build1 (NOP_EXPR, TREE_TYPE (aref),
626 build_unary_op (ADDR_EXPR, aref, /*noconvert=*/1));
628 /* Remember this as a method reference, for later devirtualization. */
629 aref = build3 (OBJ_TYPE_REF, TREE_TYPE (aref), aref, instance_ptr, idx);
634 /* Return the name of the virtual function table (as an IDENTIFIER_NODE)
635 for the given TYPE. */
638 get_vtable_name (tree type)
640 return mangle_vtbl_for_type (type);
643 /* Return an IDENTIFIER_NODE for the name of the virtual table table
647 get_vtt_name (tree type)
649 return mangle_vtt_for_type (type);
652 /* DECL is an entity associated with TYPE, like a virtual table or an
653 implicitly generated constructor. Determine whether or not DECL
654 should have external or internal linkage at the object file
655 level. This routine does not deal with COMDAT linkage and other
656 similar complexities; it simply sets TREE_PUBLIC if it possible for
657 entities in other translation units to contain copies of DECL, in
661 set_linkage_according_to_type (tree type, tree decl)
663 /* If TYPE involves a local class in a function with internal
664 linkage, then DECL should have internal linkage too. Other local
665 classes have no linkage -- but if their containing functions
666 have external linkage, it makes sense for DECL to have external
667 linkage too. That will allow template definitions to be merged,
669 if (no_linkage_check (type, /*relaxed_p=*/true))
671 TREE_PUBLIC (decl) = 0;
672 DECL_INTERFACE_KNOWN (decl) = 1;
675 TREE_PUBLIC (decl) = 1;
678 /* Create a VAR_DECL for a primary or secondary vtable for CLASS_TYPE.
679 (For a secondary vtable for B-in-D, CLASS_TYPE should be D, not B.)
680 Use NAME for the name of the vtable, and VTABLE_TYPE for its type. */
683 build_vtable (tree class_type, tree name, tree vtable_type)
687 decl = build_lang_decl (VAR_DECL, name, vtable_type);
688 /* vtable names are already mangled; give them their DECL_ASSEMBLER_NAME
689 now to avoid confusion in mangle_decl. */
690 SET_DECL_ASSEMBLER_NAME (decl, name);
691 DECL_CONTEXT (decl) = class_type;
692 DECL_ARTIFICIAL (decl) = 1;
693 TREE_STATIC (decl) = 1;
694 TREE_READONLY (decl) = 1;
695 DECL_VIRTUAL_P (decl) = 1;
696 DECL_ALIGN (decl) = TARGET_VTABLE_ENTRY_ALIGN;
697 DECL_VTABLE_OR_VTT_P (decl) = 1;
698 /* At one time the vtable info was grabbed 2 words at a time. This
699 fails on sparc unless you have 8-byte alignment. (tiemann) */
700 DECL_ALIGN (decl) = MAX (TYPE_ALIGN (double_type_node),
702 set_linkage_according_to_type (class_type, decl);
703 /* The vtable has not been defined -- yet. */
704 DECL_EXTERNAL (decl) = 1;
705 DECL_NOT_REALLY_EXTERN (decl) = 1;
707 /* Mark the VAR_DECL node representing the vtable itself as a
708 "gratuitous" one, thereby forcing dwarfout.c to ignore it. It
709 is rather important that such things be ignored because any
710 effort to actually generate DWARF for them will run into
711 trouble when/if we encounter code like:
714 struct S { virtual void member (); };
716 because the artificial declaration of the vtable itself (as
717 manufactured by the g++ front end) will say that the vtable is
718 a static member of `S' but only *after* the debug output for
719 the definition of `S' has already been output. This causes
720 grief because the DWARF entry for the definition of the vtable
721 will try to refer back to an earlier *declaration* of the
722 vtable as a static member of `S' and there won't be one. We
723 might be able to arrange to have the "vtable static member"
724 attached to the member list for `S' before the debug info for
725 `S' get written (which would solve the problem) but that would
726 require more intrusive changes to the g++ front end. */
727 DECL_IGNORED_P (decl) = 1;
732 /* Get the VAR_DECL of the vtable for TYPE. TYPE need not be polymorphic,
733 or even complete. If this does not exist, create it. If COMPLETE is
734 nonzero, then complete the definition of it -- that will render it
735 impossible to actually build the vtable, but is useful to get at those
736 which are known to exist in the runtime. */
739 get_vtable_decl (tree type, int complete)
743 if (CLASSTYPE_VTABLES (type))
744 return CLASSTYPE_VTABLES (type);
746 decl = build_vtable (type, get_vtable_name (type), vtbl_type_node);
747 CLASSTYPE_VTABLES (type) = decl;
751 DECL_EXTERNAL (decl) = 1;
752 finish_decl (decl, NULL_TREE, NULL_TREE);
758 /* Build the primary virtual function table for TYPE. If BINFO is
759 non-NULL, build the vtable starting with the initial approximation
760 that it is the same as the one which is the head of the association
761 list. Returns a nonzero value if a new vtable is actually
765 build_primary_vtable (tree binfo, tree type)
770 decl = get_vtable_decl (type, /*complete=*/0);
774 if (BINFO_NEW_VTABLE_MARKED (binfo))
775 /* We have already created a vtable for this base, so there's
776 no need to do it again. */
779 virtuals = copy_list (BINFO_VIRTUALS (binfo));
780 TREE_TYPE (decl) = TREE_TYPE (get_vtbl_decl_for_binfo (binfo));
781 DECL_SIZE (decl) = TYPE_SIZE (TREE_TYPE (decl));
782 DECL_SIZE_UNIT (decl) = TYPE_SIZE_UNIT (TREE_TYPE (decl));
786 gcc_assert (TREE_TYPE (decl) == vtbl_type_node);
787 virtuals = NULL_TREE;
790 #ifdef GATHER_STATISTICS
792 n_vtable_elems += list_length (virtuals);
795 /* Initialize the association list for this type, based
796 on our first approximation. */
797 BINFO_VTABLE (TYPE_BINFO (type)) = decl;
798 BINFO_VIRTUALS (TYPE_BINFO (type)) = virtuals;
799 SET_BINFO_NEW_VTABLE_MARKED (TYPE_BINFO (type));
803 /* Give BINFO a new virtual function table which is initialized
804 with a skeleton-copy of its original initialization. The only
805 entry that changes is the `delta' entry, so we can really
806 share a lot of structure.
808 FOR_TYPE is the most derived type which caused this table to
811 Returns nonzero if we haven't met BINFO before.
813 The order in which vtables are built (by calling this function) for
814 an object must remain the same, otherwise a binary incompatibility
818 build_secondary_vtable (tree binfo)
820 if (BINFO_NEW_VTABLE_MARKED (binfo))
821 /* We already created a vtable for this base. There's no need to
825 /* Remember that we've created a vtable for this BINFO, so that we
826 don't try to do so again. */
827 SET_BINFO_NEW_VTABLE_MARKED (binfo);
829 /* Make fresh virtual list, so we can smash it later. */
830 BINFO_VIRTUALS (binfo) = copy_list (BINFO_VIRTUALS (binfo));
832 /* Secondary vtables are laid out as part of the same structure as
833 the primary vtable. */
834 BINFO_VTABLE (binfo) = NULL_TREE;
838 /* Create a new vtable for BINFO which is the hierarchy dominated by
839 T. Return nonzero if we actually created a new vtable. */
842 make_new_vtable (tree t, tree binfo)
844 if (binfo == TYPE_BINFO (t))
845 /* In this case, it is *type*'s vtable we are modifying. We start
846 with the approximation that its vtable is that of the
847 immediate base class. */
848 return build_primary_vtable (binfo, t);
850 /* This is our very own copy of `basetype' to play with. Later,
851 we will fill in all the virtual functions that override the
852 virtual functions in these base classes which are not defined
853 by the current type. */
854 return build_secondary_vtable (binfo);
857 /* Make *VIRTUALS, an entry on the BINFO_VIRTUALS list for BINFO
858 (which is in the hierarchy dominated by T) list FNDECL as its
859 BV_FN. DELTA is the required constant adjustment from the `this'
860 pointer where the vtable entry appears to the `this' required when
861 the function is actually called. */
864 modify_vtable_entry (tree t,
874 if (fndecl != BV_FN (v)
875 || !tree_int_cst_equal (delta, BV_DELTA (v)))
877 /* We need a new vtable for BINFO. */
878 if (make_new_vtable (t, binfo))
880 /* If we really did make a new vtable, we also made a copy
881 of the BINFO_VIRTUALS list. Now, we have to find the
882 corresponding entry in that list. */
883 *virtuals = BINFO_VIRTUALS (binfo);
884 while (BV_FN (*virtuals) != BV_FN (v))
885 *virtuals = TREE_CHAIN (*virtuals);
889 BV_DELTA (v) = delta;
890 BV_VCALL_INDEX (v) = NULL_TREE;
896 /* Add method METHOD to class TYPE. If USING_DECL is non-null, it is
897 the USING_DECL naming METHOD. Returns true if the method could be
898 added to the method vec. */
901 add_method (tree type, tree method, tree using_decl)
905 bool template_conv_p = false;
907 VEC(tree,gc) *method_vec;
909 bool insert_p = false;
912 if (method == error_mark_node)
915 complete_p = COMPLETE_TYPE_P (type);
916 conv_p = DECL_CONV_FN_P (method);
918 template_conv_p = (TREE_CODE (method) == TEMPLATE_DECL
919 && DECL_TEMPLATE_CONV_FN_P (method));
921 method_vec = CLASSTYPE_METHOD_VEC (type);
924 /* Make a new method vector. We start with 8 entries. We must
925 allocate at least two (for constructors and destructors), and
926 we're going to end up with an assignment operator at some
928 method_vec = VEC_alloc (tree, gc, 8);
929 /* Create slots for constructors and destructors. */
930 VEC_quick_push (tree, method_vec, NULL_TREE);
931 VEC_quick_push (tree, method_vec, NULL_TREE);
932 CLASSTYPE_METHOD_VEC (type) = method_vec;
935 /* Constructors and destructors go in special slots. */
936 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (method))
937 slot = CLASSTYPE_CONSTRUCTOR_SLOT;
938 else if (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (method))
940 slot = CLASSTYPE_DESTRUCTOR_SLOT;
942 if (TYPE_FOR_JAVA (type))
944 if (!DECL_ARTIFICIAL (method))
945 error ("Java class %qT cannot have a destructor", type);
946 else if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
947 error ("Java class %qT cannot have an implicit non-trivial "
957 /* See if we already have an entry with this name. */
958 for (slot = CLASSTYPE_FIRST_CONVERSION_SLOT;
959 VEC_iterate (tree, method_vec, slot, m);
965 if (TREE_CODE (m) == TEMPLATE_DECL
966 && DECL_TEMPLATE_CONV_FN_P (m))
970 if (conv_p && !DECL_CONV_FN_P (m))
972 if (DECL_NAME (m) == DECL_NAME (method))
978 && !DECL_CONV_FN_P (m)
979 && DECL_NAME (m) > DECL_NAME (method))
983 current_fns = insert_p ? NULL_TREE : VEC_index (tree, method_vec, slot);
985 if (processing_template_decl)
986 /* TYPE is a template class. Don't issue any errors now; wait
987 until instantiation time to complain. */
993 /* Check to see if we've already got this method. */
994 for (fns = current_fns; fns; fns = OVL_NEXT (fns))
996 tree fn = OVL_CURRENT (fns);
1002 if (TREE_CODE (fn) != TREE_CODE (method))
1005 /* [over.load] Member function declarations with the
1006 same name and the same parameter types cannot be
1007 overloaded if any of them is a static member
1008 function declaration.
1010 [namespace.udecl] When a using-declaration brings names
1011 from a base class into a derived class scope, member
1012 functions in the derived class override and/or hide member
1013 functions with the same name and parameter types in a base
1014 class (rather than conflicting). */
1015 fn_type = TREE_TYPE (fn);
1016 method_type = TREE_TYPE (method);
1017 parms1 = TYPE_ARG_TYPES (fn_type);
1018 parms2 = TYPE_ARG_TYPES (method_type);
1020 /* Compare the quals on the 'this' parm. Don't compare
1021 the whole types, as used functions are treated as
1022 coming from the using class in overload resolution. */
1023 if (! DECL_STATIC_FUNCTION_P (fn)
1024 && ! DECL_STATIC_FUNCTION_P (method)
1025 && (TYPE_QUALS (TREE_TYPE (TREE_VALUE (parms1)))
1026 != TYPE_QUALS (TREE_TYPE (TREE_VALUE (parms2)))))
1029 /* For templates, the return type and template parameters
1030 must be identical. */
1031 if (TREE_CODE (fn) == TEMPLATE_DECL
1032 && (!same_type_p (TREE_TYPE (fn_type),
1033 TREE_TYPE (method_type))
1034 || !comp_template_parms (DECL_TEMPLATE_PARMS (fn),
1035 DECL_TEMPLATE_PARMS (method))))
1038 if (! DECL_STATIC_FUNCTION_P (fn))
1039 parms1 = TREE_CHAIN (parms1);
1040 if (! DECL_STATIC_FUNCTION_P (method))
1041 parms2 = TREE_CHAIN (parms2);
1043 if (compparms (parms1, parms2)
1044 && (!DECL_CONV_FN_P (fn)
1045 || same_type_p (TREE_TYPE (fn_type),
1046 TREE_TYPE (method_type))))
1050 if (DECL_CONTEXT (fn) == type)
1051 /* Defer to the local function. */
1053 if (DECL_CONTEXT (fn) == DECL_CONTEXT (method))
1054 error ("repeated using declaration %q+D", using_decl);
1056 error ("using declaration %q+D conflicts with a previous using declaration",
1061 error ("%q+#D cannot be overloaded", method);
1062 error ("with %q+#D", fn);
1065 /* We don't call duplicate_decls here to merge the
1066 declarations because that will confuse things if the
1067 methods have inline definitions. In particular, we
1068 will crash while processing the definitions. */
1074 /* A class should never have more than one destructor. */
1075 if (current_fns && DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (method))
1078 /* Add the new binding. */
1079 overload = build_overload (method, current_fns);
1082 TYPE_HAS_CONVERSION (type) = 1;
1083 else if (slot >= CLASSTYPE_FIRST_CONVERSION_SLOT && !complete_p)
1084 push_class_level_binding (DECL_NAME (method), overload);
1088 /* We only expect to add few methods in the COMPLETE_P case, so
1089 just make room for one more method in that case. */
1090 if (VEC_reserve (tree, gc, method_vec, complete_p ? -1 : 1))
1091 CLASSTYPE_METHOD_VEC (type) = method_vec;
1092 if (slot == VEC_length (tree, method_vec))
1093 VEC_quick_push (tree, method_vec, overload);
1095 VEC_quick_insert (tree, method_vec, slot, overload);
1098 /* Replace the current slot. */
1099 VEC_replace (tree, method_vec, slot, overload);
1103 /* Subroutines of finish_struct. */
1105 /* Change the access of FDECL to ACCESS in T. Return 1 if change was
1106 legit, otherwise return 0. */
1109 alter_access (tree t, tree fdecl, tree access)
1113 if (!DECL_LANG_SPECIFIC (fdecl))
1114 retrofit_lang_decl (fdecl);
1116 gcc_assert (!DECL_DISCRIMINATOR_P (fdecl));
1118 elem = purpose_member (t, DECL_ACCESS (fdecl));
1121 if (TREE_VALUE (elem) != access)
1123 if (TREE_CODE (TREE_TYPE (fdecl)) == FUNCTION_DECL)
1124 error ("conflicting access specifications for method"
1125 " %q+D, ignored", TREE_TYPE (fdecl));
1127 error ("conflicting access specifications for field %qE, ignored",
1132 /* They're changing the access to the same thing they changed
1133 it to before. That's OK. */
1139 perform_or_defer_access_check (TYPE_BINFO (t), fdecl);
1140 DECL_ACCESS (fdecl) = tree_cons (t, access, DECL_ACCESS (fdecl));
1146 /* Process the USING_DECL, which is a member of T. */
1149 handle_using_decl (tree using_decl, tree t)
1151 tree decl = USING_DECL_DECLS (using_decl);
1152 tree name = DECL_NAME (using_decl);
1154 = TREE_PRIVATE (using_decl) ? access_private_node
1155 : TREE_PROTECTED (using_decl) ? access_protected_node
1156 : access_public_node;
1157 tree flist = NULL_TREE;
1160 gcc_assert (!processing_template_decl && decl);
1162 old_value = lookup_member (t, name, /*protect=*/0, /*want_type=*/false);
1165 if (is_overloaded_fn (old_value))
1166 old_value = OVL_CURRENT (old_value);
1168 if (DECL_P (old_value) && DECL_CONTEXT (old_value) == t)
1171 old_value = NULL_TREE;
1174 cp_emit_debug_info_for_using (decl, USING_DECL_SCOPE (using_decl));
1176 if (is_overloaded_fn (decl))
1181 else if (is_overloaded_fn (old_value))
1184 /* It's OK to use functions from a base when there are functions with
1185 the same name already present in the current class. */;
1188 error ("%q+D invalid in %q#T", using_decl, t);
1189 error (" because of local method %q+#D with same name",
1190 OVL_CURRENT (old_value));
1194 else if (!DECL_ARTIFICIAL (old_value))
1196 error ("%q+D invalid in %q#T", using_decl, t);
1197 error (" because of local member %q+#D with same name", old_value);
1201 /* Make type T see field decl FDECL with access ACCESS. */
1203 for (; flist; flist = OVL_NEXT (flist))
1205 add_method (t, OVL_CURRENT (flist), using_decl);
1206 alter_access (t, OVL_CURRENT (flist), access);
1209 alter_access (t, decl, access);
1212 /* Run through the base classes of T, updating CANT_HAVE_CONST_CTOR_P,
1213 and NO_CONST_ASN_REF_P. Also set flag bits in T based on
1214 properties of the bases. */
1217 check_bases (tree t,
1218 int* cant_have_const_ctor_p,
1219 int* no_const_asn_ref_p)
1222 int seen_non_virtual_nearly_empty_base_p;
1226 seen_non_virtual_nearly_empty_base_p = 0;
1228 for (binfo = TYPE_BINFO (t), i = 0;
1229 BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
1231 tree basetype = TREE_TYPE (base_binfo);
1233 gcc_assert (COMPLETE_TYPE_P (basetype));
1235 /* Effective C++ rule 14. We only need to check TYPE_POLYMORPHIC_P
1236 here because the case of virtual functions but non-virtual
1237 dtor is handled in finish_struct_1. */
1238 if (warn_ecpp && ! TYPE_POLYMORPHIC_P (basetype))
1239 warning (0, "base class %q#T has a non-virtual destructor", basetype);
1241 /* If the base class doesn't have copy constructors or
1242 assignment operators that take const references, then the
1243 derived class cannot have such a member automatically
1245 if (! TYPE_HAS_CONST_INIT_REF (basetype))
1246 *cant_have_const_ctor_p = 1;
1247 if (TYPE_HAS_ASSIGN_REF (basetype)
1248 && !TYPE_HAS_CONST_ASSIGN_REF (basetype))
1249 *no_const_asn_ref_p = 1;
1251 if (BINFO_VIRTUAL_P (base_binfo))
1252 /* A virtual base does not effect nearly emptiness. */
1254 else if (CLASSTYPE_NEARLY_EMPTY_P (basetype))
1256 if (seen_non_virtual_nearly_empty_base_p)
1257 /* And if there is more than one nearly empty base, then the
1258 derived class is not nearly empty either. */
1259 CLASSTYPE_NEARLY_EMPTY_P (t) = 0;
1261 /* Remember we've seen one. */
1262 seen_non_virtual_nearly_empty_base_p = 1;
1264 else if (!is_empty_class (basetype))
1265 /* If the base class is not empty or nearly empty, then this
1266 class cannot be nearly empty. */
1267 CLASSTYPE_NEARLY_EMPTY_P (t) = 0;
1269 /* A lot of properties from the bases also apply to the derived
1271 TYPE_NEEDS_CONSTRUCTING (t) |= TYPE_NEEDS_CONSTRUCTING (basetype);
1272 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t)
1273 |= TYPE_HAS_NONTRIVIAL_DESTRUCTOR (basetype);
1274 TYPE_HAS_COMPLEX_ASSIGN_REF (t)
1275 |= TYPE_HAS_COMPLEX_ASSIGN_REF (basetype);
1276 TYPE_HAS_COMPLEX_INIT_REF (t) |= TYPE_HAS_COMPLEX_INIT_REF (basetype);
1277 TYPE_POLYMORPHIC_P (t) |= TYPE_POLYMORPHIC_P (basetype);
1278 CLASSTYPE_CONTAINS_EMPTY_CLASS_P (t)
1279 |= CLASSTYPE_CONTAINS_EMPTY_CLASS_P (basetype);
1283 /* Determine all the primary bases within T. Sets BINFO_PRIMARY_BASE_P for
1284 those that are primaries. Sets BINFO_LOST_PRIMARY_P for those
1285 that have had a nearly-empty virtual primary base stolen by some
1286 other base in the hierarchy. Determines CLASSTYPE_PRIMARY_BASE for
1290 determine_primary_bases (tree t)
1293 tree primary = NULL_TREE;
1294 tree type_binfo = TYPE_BINFO (t);
1297 /* Determine the primary bases of our bases. */
1298 for (base_binfo = TREE_CHAIN (type_binfo); base_binfo;
1299 base_binfo = TREE_CHAIN (base_binfo))
1301 tree primary = CLASSTYPE_PRIMARY_BINFO (BINFO_TYPE (base_binfo));
1303 /* See if we're the non-virtual primary of our inheritance
1305 if (!BINFO_VIRTUAL_P (base_binfo))
1307 tree parent = BINFO_INHERITANCE_CHAIN (base_binfo);
1308 tree parent_primary = CLASSTYPE_PRIMARY_BINFO (BINFO_TYPE (parent));
1311 && SAME_BINFO_TYPE_P (BINFO_TYPE (base_binfo),
1312 BINFO_TYPE (parent_primary)))
1313 /* We are the primary binfo. */
1314 BINFO_PRIMARY_P (base_binfo) = 1;
1316 /* Determine if we have a virtual primary base, and mark it so.
1318 if (primary && BINFO_VIRTUAL_P (primary))
1320 tree this_primary = copied_binfo (primary, base_binfo);
1322 if (BINFO_PRIMARY_P (this_primary))
1323 /* Someone already claimed this base. */
1324 BINFO_LOST_PRIMARY_P (base_binfo) = 1;
1329 BINFO_PRIMARY_P (this_primary) = 1;
1330 BINFO_INHERITANCE_CHAIN (this_primary) = base_binfo;
1332 /* A virtual binfo might have been copied from within
1333 another hierarchy. As we're about to use it as a
1334 primary base, make sure the offsets match. */
1335 delta = size_diffop (convert (ssizetype,
1336 BINFO_OFFSET (base_binfo)),
1338 BINFO_OFFSET (this_primary)));
1340 propagate_binfo_offsets (this_primary, delta);
1345 /* First look for a dynamic direct non-virtual base. */
1346 for (i = 0; BINFO_BASE_ITERATE (type_binfo, i, base_binfo); i++)
1348 tree basetype = BINFO_TYPE (base_binfo);
1350 if (TYPE_CONTAINS_VPTR_P (basetype) && !BINFO_VIRTUAL_P (base_binfo))
1352 primary = base_binfo;
1357 /* A "nearly-empty" virtual base class can be the primary base
1358 class, if no non-virtual polymorphic base can be found. Look for
1359 a nearly-empty virtual dynamic base that is not already a primary
1360 base of something in the hierarchy. If there is no such base,
1361 just pick the first nearly-empty virtual base. */
1363 for (base_binfo = TREE_CHAIN (type_binfo); base_binfo;
1364 base_binfo = TREE_CHAIN (base_binfo))
1365 if (BINFO_VIRTUAL_P (base_binfo)
1366 && CLASSTYPE_NEARLY_EMPTY_P (BINFO_TYPE (base_binfo)))
1368 if (!BINFO_PRIMARY_P (base_binfo))
1370 /* Found one that is not primary. */
1371 primary = base_binfo;
1375 /* Remember the first candidate. */
1376 primary = base_binfo;
1380 /* If we've got a primary base, use it. */
1383 tree basetype = BINFO_TYPE (primary);
1385 CLASSTYPE_PRIMARY_BINFO (t) = primary;
1386 if (BINFO_PRIMARY_P (primary))
1387 /* We are stealing a primary base. */
1388 BINFO_LOST_PRIMARY_P (BINFO_INHERITANCE_CHAIN (primary)) = 1;
1389 BINFO_PRIMARY_P (primary) = 1;
1390 if (BINFO_VIRTUAL_P (primary))
1394 BINFO_INHERITANCE_CHAIN (primary) = type_binfo;
1395 /* A virtual binfo might have been copied from within
1396 another hierarchy. As we're about to use it as a primary
1397 base, make sure the offsets match. */
1398 delta = size_diffop (ssize_int (0),
1399 convert (ssizetype, BINFO_OFFSET (primary)));
1401 propagate_binfo_offsets (primary, delta);
1404 primary = TYPE_BINFO (basetype);
1406 TYPE_VFIELD (t) = TYPE_VFIELD (basetype);
1407 BINFO_VTABLE (type_binfo) = BINFO_VTABLE (primary);
1408 BINFO_VIRTUALS (type_binfo) = BINFO_VIRTUALS (primary);
1412 /* Set memoizing fields and bits of T (and its variants) for later
1416 finish_struct_bits (tree t)
1420 /* Fix up variants (if any). */
1421 for (variants = TYPE_NEXT_VARIANT (t);
1423 variants = TYPE_NEXT_VARIANT (variants))
1425 /* These fields are in the _TYPE part of the node, not in
1426 the TYPE_LANG_SPECIFIC component, so they are not shared. */
1427 TYPE_HAS_CONSTRUCTOR (variants) = TYPE_HAS_CONSTRUCTOR (t);
1428 TYPE_NEEDS_CONSTRUCTING (variants) = TYPE_NEEDS_CONSTRUCTING (t);
1429 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (variants)
1430 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t);
1432 TYPE_POLYMORPHIC_P (variants) = TYPE_POLYMORPHIC_P (t);
1434 TYPE_BINFO (variants) = TYPE_BINFO (t);
1436 /* Copy whatever these are holding today. */
1437 TYPE_VFIELD (variants) = TYPE_VFIELD (t);
1438 TYPE_METHODS (variants) = TYPE_METHODS (t);
1439 TYPE_FIELDS (variants) = TYPE_FIELDS (t);
1440 TYPE_SIZE (variants) = TYPE_SIZE (t);
1441 TYPE_SIZE_UNIT (variants) = TYPE_SIZE_UNIT (t);
1444 if (BINFO_N_BASE_BINFOS (TYPE_BINFO (t)) && TYPE_POLYMORPHIC_P (t))
1445 /* For a class w/o baseclasses, 'finish_struct' has set
1446 CLASSTYPE_PURE_VIRTUALS correctly (by definition).
1447 Similarly for a class whose base classes do not have vtables.
1448 When neither of these is true, we might have removed abstract
1449 virtuals (by providing a definition), added some (by declaring
1450 new ones), or redeclared ones from a base class. We need to
1451 recalculate what's really an abstract virtual at this point (by
1452 looking in the vtables). */
1453 get_pure_virtuals (t);
1455 /* If this type has a copy constructor or a destructor, force its
1456 mode to be BLKmode, and force its TREE_ADDRESSABLE bit to be
1457 nonzero. This will cause it to be passed by invisible reference
1458 and prevent it from being returned in a register. */
1459 if (! TYPE_HAS_TRIVIAL_INIT_REF (t) || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t))
1462 DECL_MODE (TYPE_MAIN_DECL (t)) = BLKmode;
1463 for (variants = t; variants; variants = TYPE_NEXT_VARIANT (variants))
1465 TYPE_MODE (variants) = BLKmode;
1466 TREE_ADDRESSABLE (variants) = 1;
1471 /* Issue warnings about T having private constructors, but no friends,
1474 HAS_NONPRIVATE_METHOD is nonzero if T has any non-private methods or
1475 static members. HAS_NONPRIVATE_STATIC_FN is nonzero if T has any
1476 non-private static member functions. */
1479 maybe_warn_about_overly_private_class (tree t)
1481 int has_member_fn = 0;
1482 int has_nonprivate_method = 0;
1485 if (!warn_ctor_dtor_privacy
1486 /* If the class has friends, those entities might create and
1487 access instances, so we should not warn. */
1488 || (CLASSTYPE_FRIEND_CLASSES (t)
1489 || DECL_FRIENDLIST (TYPE_MAIN_DECL (t)))
1490 /* We will have warned when the template was declared; there's
1491 no need to warn on every instantiation. */
1492 || CLASSTYPE_TEMPLATE_INSTANTIATION (t))
1493 /* There's no reason to even consider warning about this
1497 /* We only issue one warning, if more than one applies, because
1498 otherwise, on code like:
1501 // Oops - forgot `public:'
1507 we warn several times about essentially the same problem. */
1509 /* Check to see if all (non-constructor, non-destructor) member
1510 functions are private. (Since there are no friends or
1511 non-private statics, we can't ever call any of the private member
1513 for (fn = TYPE_METHODS (t); fn; fn = TREE_CHAIN (fn))
1514 /* We're not interested in compiler-generated methods; they don't
1515 provide any way to call private members. */
1516 if (!DECL_ARTIFICIAL (fn))
1518 if (!TREE_PRIVATE (fn))
1520 if (DECL_STATIC_FUNCTION_P (fn))
1521 /* A non-private static member function is just like a
1522 friend; it can create and invoke private member
1523 functions, and be accessed without a class
1527 has_nonprivate_method = 1;
1528 /* Keep searching for a static member function. */
1530 else if (!DECL_CONSTRUCTOR_P (fn) && !DECL_DESTRUCTOR_P (fn))
1534 if (!has_nonprivate_method && has_member_fn)
1536 /* There are no non-private methods, and there's at least one
1537 private member function that isn't a constructor or
1538 destructor. (If all the private members are
1539 constructors/destructors we want to use the code below that
1540 issues error messages specifically referring to
1541 constructors/destructors.) */
1543 tree binfo = TYPE_BINFO (t);
1545 for (i = 0; i != BINFO_N_BASE_BINFOS (binfo); i++)
1546 if (BINFO_BASE_ACCESS (binfo, i) != access_private_node)
1548 has_nonprivate_method = 1;
1551 if (!has_nonprivate_method)
1553 warning (0, "all member functions in class %qT are private", t);
1558 /* Even if some of the member functions are non-private, the class
1559 won't be useful for much if all the constructors or destructors
1560 are private: such an object can never be created or destroyed. */
1561 fn = CLASSTYPE_DESTRUCTORS (t);
1562 if (fn && TREE_PRIVATE (fn))
1564 warning (0, "%q#T only defines a private destructor and has no friends",
1569 if (TYPE_HAS_CONSTRUCTOR (t)
1570 /* Implicitly generated constructors are always public. */
1571 && (!CLASSTYPE_LAZY_DEFAULT_CTOR (t)
1572 || !CLASSTYPE_LAZY_COPY_CTOR (t)))
1574 int nonprivate_ctor = 0;
1576 /* If a non-template class does not define a copy
1577 constructor, one is defined for it, enabling it to avoid
1578 this warning. For a template class, this does not
1579 happen, and so we would normally get a warning on:
1581 template <class T> class C { private: C(); };
1583 To avoid this asymmetry, we check TYPE_HAS_INIT_REF. All
1584 complete non-template or fully instantiated classes have this
1586 if (!TYPE_HAS_INIT_REF (t))
1587 nonprivate_ctor = 1;
1589 for (fn = CLASSTYPE_CONSTRUCTORS (t); fn; fn = OVL_NEXT (fn))
1591 tree ctor = OVL_CURRENT (fn);
1592 /* Ideally, we wouldn't count copy constructors (or, in
1593 fact, any constructor that takes an argument of the
1594 class type as a parameter) because such things cannot
1595 be used to construct an instance of the class unless
1596 you already have one. But, for now at least, we're
1598 if (! TREE_PRIVATE (ctor))
1600 nonprivate_ctor = 1;
1605 if (nonprivate_ctor == 0)
1607 warning (0, "%q#T only defines private constructors and has no friends",
1615 gt_pointer_operator new_value;
1619 /* Comparison function to compare two TYPE_METHOD_VEC entries by name. */
1622 method_name_cmp (const void* m1_p, const void* m2_p)
1624 const tree *const m1 = m1_p;
1625 const tree *const m2 = m2_p;
1627 if (*m1 == NULL_TREE && *m2 == NULL_TREE)
1629 if (*m1 == NULL_TREE)
1631 if (*m2 == NULL_TREE)
1633 if (DECL_NAME (OVL_CURRENT (*m1)) < DECL_NAME (OVL_CURRENT (*m2)))
1638 /* This routine compares two fields like method_name_cmp but using the
1639 pointer operator in resort_field_decl_data. */
1642 resort_method_name_cmp (const void* m1_p, const void* m2_p)
1644 const tree *const m1 = m1_p;
1645 const tree *const m2 = m2_p;
1646 if (*m1 == NULL_TREE && *m2 == NULL_TREE)
1648 if (*m1 == NULL_TREE)
1650 if (*m2 == NULL_TREE)
1653 tree d1 = DECL_NAME (OVL_CURRENT (*m1));
1654 tree d2 = DECL_NAME (OVL_CURRENT (*m2));
1655 resort_data.new_value (&d1, resort_data.cookie);
1656 resort_data.new_value (&d2, resort_data.cookie);
1663 /* Resort TYPE_METHOD_VEC because pointers have been reordered. */
1666 resort_type_method_vec (void* obj,
1667 void* orig_obj ATTRIBUTE_UNUSED ,
1668 gt_pointer_operator new_value,
1671 VEC(tree,gc) *method_vec = (VEC(tree,gc) *) obj;
1672 int len = VEC_length (tree, method_vec);
1676 /* The type conversion ops have to live at the front of the vec, so we
1678 for (slot = CLASSTYPE_FIRST_CONVERSION_SLOT;
1679 VEC_iterate (tree, method_vec, slot, fn);
1681 if (!DECL_CONV_FN_P (OVL_CURRENT (fn)))
1686 resort_data.new_value = new_value;
1687 resort_data.cookie = cookie;
1688 qsort (VEC_address (tree, method_vec) + slot, len - slot, sizeof (tree),
1689 resort_method_name_cmp);
1693 /* Warn about duplicate methods in fn_fields.
1695 Sort methods that are not special (i.e., constructors, destructors,
1696 and type conversion operators) so that we can find them faster in
1700 finish_struct_methods (tree t)
1703 VEC(tree,gc) *method_vec;
1706 method_vec = CLASSTYPE_METHOD_VEC (t);
1710 len = VEC_length (tree, method_vec);
1712 /* Clear DECL_IN_AGGR_P for all functions. */
1713 for (fn_fields = TYPE_METHODS (t); fn_fields;
1714 fn_fields = TREE_CHAIN (fn_fields))
1715 DECL_IN_AGGR_P (fn_fields) = 0;
1717 /* Issue warnings about private constructors and such. If there are
1718 no methods, then some public defaults are generated. */
1719 maybe_warn_about_overly_private_class (t);
1721 /* The type conversion ops have to live at the front of the vec, so we
1723 for (slot = CLASSTYPE_FIRST_CONVERSION_SLOT;
1724 VEC_iterate (tree, method_vec, slot, fn_fields);
1726 if (!DECL_CONV_FN_P (OVL_CURRENT (fn_fields)))
1729 qsort (VEC_address (tree, method_vec) + slot,
1730 len-slot, sizeof (tree), method_name_cmp);
1733 /* Make BINFO's vtable have N entries, including RTTI entries,
1734 vbase and vcall offsets, etc. Set its type and call the backend
1738 layout_vtable_decl (tree binfo, int n)
1743 atype = build_cplus_array_type (vtable_entry_type,
1744 build_index_type (size_int (n - 1)));
1745 layout_type (atype);
1747 /* We may have to grow the vtable. */
1748 vtable = get_vtbl_decl_for_binfo (binfo);
1749 if (!same_type_p (TREE_TYPE (vtable), atype))
1751 TREE_TYPE (vtable) = atype;
1752 DECL_SIZE (vtable) = DECL_SIZE_UNIT (vtable) = NULL_TREE;
1753 layout_decl (vtable, 0);
1757 /* True iff FNDECL and BASE_FNDECL (both non-static member functions)
1758 have the same signature. */
1761 same_signature_p (tree fndecl, tree base_fndecl)
1763 /* One destructor overrides another if they are the same kind of
1765 if (DECL_DESTRUCTOR_P (base_fndecl) && DECL_DESTRUCTOR_P (fndecl)
1766 && special_function_p (base_fndecl) == special_function_p (fndecl))
1768 /* But a non-destructor never overrides a destructor, nor vice
1769 versa, nor do different kinds of destructors override
1770 one-another. For example, a complete object destructor does not
1771 override a deleting destructor. */
1772 if (DECL_DESTRUCTOR_P (base_fndecl) || DECL_DESTRUCTOR_P (fndecl))
1775 if (DECL_NAME (fndecl) == DECL_NAME (base_fndecl)
1776 || (DECL_CONV_FN_P (fndecl)
1777 && DECL_CONV_FN_P (base_fndecl)
1778 && same_type_p (DECL_CONV_FN_TYPE (fndecl),
1779 DECL_CONV_FN_TYPE (base_fndecl))))
1781 tree types, base_types;
1782 types = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
1783 base_types = TYPE_ARG_TYPES (TREE_TYPE (base_fndecl));
1784 if ((TYPE_QUALS (TREE_TYPE (TREE_VALUE (base_types)))
1785 == TYPE_QUALS (TREE_TYPE (TREE_VALUE (types))))
1786 && compparms (TREE_CHAIN (base_types), TREE_CHAIN (types)))
1792 /* Returns TRUE if DERIVED is a binfo containing the binfo BASE as a
1796 base_derived_from (tree derived, tree base)
1800 for (probe = base; probe; probe = BINFO_INHERITANCE_CHAIN (probe))
1802 if (probe == derived)
1804 else if (BINFO_VIRTUAL_P (probe))
1805 /* If we meet a virtual base, we can't follow the inheritance
1806 any more. See if the complete type of DERIVED contains
1807 such a virtual base. */
1808 return (binfo_for_vbase (BINFO_TYPE (probe), BINFO_TYPE (derived))
1814 typedef struct find_final_overrider_data_s {
1815 /* The function for which we are trying to find a final overrider. */
1817 /* The base class in which the function was declared. */
1818 tree declaring_base;
1819 /* The candidate overriders. */
1821 /* Path to most derived. */
1822 VEC(tree,heap) *path;
1823 } find_final_overrider_data;
1825 /* Add the overrider along the current path to FFOD->CANDIDATES.
1826 Returns true if an overrider was found; false otherwise. */
1829 dfs_find_final_overrider_1 (tree binfo,
1830 find_final_overrider_data *ffod,
1835 /* If BINFO is not the most derived type, try a more derived class.
1836 A definition there will overrider a definition here. */
1840 if (dfs_find_final_overrider_1
1841 (VEC_index (tree, ffod->path, depth), ffod, depth))
1845 method = look_for_overrides_here (BINFO_TYPE (binfo), ffod->fn);
1848 tree *candidate = &ffod->candidates;
1850 /* Remove any candidates overridden by this new function. */
1853 /* If *CANDIDATE overrides METHOD, then METHOD
1854 cannot override anything else on the list. */
1855 if (base_derived_from (TREE_VALUE (*candidate), binfo))
1857 /* If METHOD overrides *CANDIDATE, remove *CANDIDATE. */
1858 if (base_derived_from (binfo, TREE_VALUE (*candidate)))
1859 *candidate = TREE_CHAIN (*candidate);
1861 candidate = &TREE_CHAIN (*candidate);
1864 /* Add the new function. */
1865 ffod->candidates = tree_cons (method, binfo, ffod->candidates);
1872 /* Called from find_final_overrider via dfs_walk. */
1875 dfs_find_final_overrider_pre (tree binfo, void *data)
1877 find_final_overrider_data *ffod = (find_final_overrider_data *) data;
1879 if (binfo == ffod->declaring_base)
1880 dfs_find_final_overrider_1 (binfo, ffod, VEC_length (tree, ffod->path));
1881 VEC_safe_push (tree, heap, ffod->path, binfo);
1887 dfs_find_final_overrider_post (tree binfo ATTRIBUTE_UNUSED, void *data)
1889 find_final_overrider_data *ffod = (find_final_overrider_data *) data;
1890 VEC_pop (tree, ffod->path);
1895 /* Returns a TREE_LIST whose TREE_PURPOSE is the final overrider for
1896 FN and whose TREE_VALUE is the binfo for the base where the
1897 overriding occurs. BINFO (in the hierarchy dominated by the binfo
1898 DERIVED) is the base object in which FN is declared. */
1901 find_final_overrider (tree derived, tree binfo, tree fn)
1903 find_final_overrider_data ffod;
1905 /* Getting this right is a little tricky. This is valid:
1907 struct S { virtual void f (); };
1908 struct T { virtual void f (); };
1909 struct U : public S, public T { };
1911 even though calling `f' in `U' is ambiguous. But,
1913 struct R { virtual void f(); };
1914 struct S : virtual public R { virtual void f (); };
1915 struct T : virtual public R { virtual void f (); };
1916 struct U : public S, public T { };
1918 is not -- there's no way to decide whether to put `S::f' or
1919 `T::f' in the vtable for `R'.
1921 The solution is to look at all paths to BINFO. If we find
1922 different overriders along any two, then there is a problem. */
1923 if (DECL_THUNK_P (fn))
1924 fn = THUNK_TARGET (fn);
1926 /* Determine the depth of the hierarchy. */
1928 ffod.declaring_base = binfo;
1929 ffod.candidates = NULL_TREE;
1930 ffod.path = VEC_alloc (tree, heap, 30);
1932 dfs_walk_all (derived, dfs_find_final_overrider_pre,
1933 dfs_find_final_overrider_post, &ffod);
1935 VEC_free (tree, heap, ffod.path);
1937 /* If there was no winner, issue an error message. */
1938 if (!ffod.candidates || TREE_CHAIN (ffod.candidates))
1939 return error_mark_node;
1941 return ffod.candidates;
1944 /* Return the index of the vcall offset for FN when TYPE is used as a
1948 get_vcall_index (tree fn, tree type)
1950 VEC(tree_pair_s,gc) *indices = CLASSTYPE_VCALL_INDICES (type);
1954 for (ix = 0; VEC_iterate (tree_pair_s, indices, ix, p); ix++)
1955 if ((DECL_DESTRUCTOR_P (fn) && DECL_DESTRUCTOR_P (p->purpose))
1956 || same_signature_p (fn, p->purpose))
1959 /* There should always be an appropriate index. */
1963 /* Update an entry in the vtable for BINFO, which is in the hierarchy
1964 dominated by T. FN has been overridden in BINFO; VIRTUALS points to the
1965 corresponding position in the BINFO_VIRTUALS list. */
1968 update_vtable_entry_for_fn (tree t, tree binfo, tree fn, tree* virtuals,
1976 tree overrider_fn, overrider_target;
1977 tree target_fn = DECL_THUNK_P (fn) ? THUNK_TARGET (fn) : fn;
1978 tree over_return, base_return;
1981 /* Find the nearest primary base (possibly binfo itself) which defines
1982 this function; this is the class the caller will convert to when
1983 calling FN through BINFO. */
1984 for (b = binfo; ; b = get_primary_binfo (b))
1987 if (look_for_overrides_here (BINFO_TYPE (b), target_fn))
1990 /* The nearest definition is from a lost primary. */
1991 if (BINFO_LOST_PRIMARY_P (b))
1996 /* Find the final overrider. */
1997 overrider = find_final_overrider (TYPE_BINFO (t), b, target_fn);
1998 if (overrider == error_mark_node)
2000 error ("no unique final overrider for %qD in %qT", target_fn, t);
2003 overrider_target = overrider_fn = TREE_PURPOSE (overrider);
2005 /* Check for adjusting covariant return types. */
2006 over_return = TREE_TYPE (TREE_TYPE (overrider_target));
2007 base_return = TREE_TYPE (TREE_TYPE (target_fn));
2009 if (POINTER_TYPE_P (over_return)
2010 && TREE_CODE (over_return) == TREE_CODE (base_return)
2011 && CLASS_TYPE_P (TREE_TYPE (over_return))
2012 && CLASS_TYPE_P (TREE_TYPE (base_return))
2013 /* If the overrider is invalid, don't even try. */
2014 && !DECL_INVALID_OVERRIDER_P (overrider_target))
2016 /* If FN is a covariant thunk, we must figure out the adjustment
2017 to the final base FN was converting to. As OVERRIDER_TARGET might
2018 also be converting to the return type of FN, we have to
2019 combine the two conversions here. */
2020 tree fixed_offset, virtual_offset;
2022 over_return = TREE_TYPE (over_return);
2023 base_return = TREE_TYPE (base_return);
2025 if (DECL_THUNK_P (fn))
2027 gcc_assert (DECL_RESULT_THUNK_P (fn));
2028 fixed_offset = ssize_int (THUNK_FIXED_OFFSET (fn));
2029 virtual_offset = THUNK_VIRTUAL_OFFSET (fn);
2032 fixed_offset = virtual_offset = NULL_TREE;
2035 /* Find the equivalent binfo within the return type of the
2036 overriding function. We will want the vbase offset from
2038 virtual_offset = binfo_for_vbase (BINFO_TYPE (virtual_offset),
2040 else if (!same_type_ignoring_top_level_qualifiers_p
2041 (over_return, base_return))
2043 /* There was no existing virtual thunk (which takes
2044 precedence). So find the binfo of the base function's
2045 return type within the overriding function's return type.
2046 We cannot call lookup base here, because we're inside a
2047 dfs_walk, and will therefore clobber the BINFO_MARKED
2048 flags. Fortunately we know the covariancy is valid (it
2049 has already been checked), so we can just iterate along
2050 the binfos, which have been chained in inheritance graph
2051 order. Of course it is lame that we have to repeat the
2052 search here anyway -- we should really be caching pieces
2053 of the vtable and avoiding this repeated work. */
2054 tree thunk_binfo, base_binfo;
2056 /* Find the base binfo within the overriding function's
2057 return type. We will always find a thunk_binfo, except
2058 when the covariancy is invalid (which we will have
2059 already diagnosed). */
2060 for (base_binfo = TYPE_BINFO (base_return),
2061 thunk_binfo = TYPE_BINFO (over_return);
2063 thunk_binfo = TREE_CHAIN (thunk_binfo))
2064 if (SAME_BINFO_TYPE_P (BINFO_TYPE (thunk_binfo),
2065 BINFO_TYPE (base_binfo)))
2068 /* See if virtual inheritance is involved. */
2069 for (virtual_offset = thunk_binfo;
2071 virtual_offset = BINFO_INHERITANCE_CHAIN (virtual_offset))
2072 if (BINFO_VIRTUAL_P (virtual_offset))
2076 || (thunk_binfo && !BINFO_OFFSET_ZEROP (thunk_binfo)))
2078 tree offset = convert (ssizetype, BINFO_OFFSET (thunk_binfo));
2082 /* We convert via virtual base. Adjust the fixed
2083 offset to be from there. */
2084 offset = size_diffop
2086 (ssizetype, BINFO_OFFSET (virtual_offset)));
2089 /* There was an existing fixed offset, this must be
2090 from the base just converted to, and the base the
2091 FN was thunking to. */
2092 fixed_offset = size_binop (PLUS_EXPR, fixed_offset, offset);
2094 fixed_offset = offset;
2098 if (fixed_offset || virtual_offset)
2099 /* Replace the overriding function with a covariant thunk. We
2100 will emit the overriding function in its own slot as
2102 overrider_fn = make_thunk (overrider_target, /*this_adjusting=*/0,
2103 fixed_offset, virtual_offset);
2106 gcc_assert (!DECL_THUNK_P (fn));
2108 /* Assume that we will produce a thunk that convert all the way to
2109 the final overrider, and not to an intermediate virtual base. */
2110 virtual_base = NULL_TREE;
2112 /* See if we can convert to an intermediate virtual base first, and then
2113 use the vcall offset located there to finish the conversion. */
2114 for (; b; b = BINFO_INHERITANCE_CHAIN (b))
2116 /* If we find the final overrider, then we can stop
2118 if (SAME_BINFO_TYPE_P (BINFO_TYPE (b),
2119 BINFO_TYPE (TREE_VALUE (overrider))))
2122 /* If we find a virtual base, and we haven't yet found the
2123 overrider, then there is a virtual base between the
2124 declaring base (first_defn) and the final overrider. */
2125 if (BINFO_VIRTUAL_P (b))
2132 if (overrider_fn != overrider_target && !virtual_base)
2134 /* The ABI specifies that a covariant thunk includes a mangling
2135 for a this pointer adjustment. This-adjusting thunks that
2136 override a function from a virtual base have a vcall
2137 adjustment. When the virtual base in question is a primary
2138 virtual base, we know the adjustments are zero, (and in the
2139 non-covariant case, we would not use the thunk).
2140 Unfortunately we didn't notice this could happen, when
2141 designing the ABI and so never mandated that such a covariant
2142 thunk should be emitted. Because we must use the ABI mandated
2143 name, we must continue searching from the binfo where we
2144 found the most recent definition of the function, towards the
2145 primary binfo which first introduced the function into the
2146 vtable. If that enters a virtual base, we must use a vcall
2147 this-adjusting thunk. Bleah! */
2148 tree probe = first_defn;
2150 while ((probe = get_primary_binfo (probe))
2151 && (unsigned) list_length (BINFO_VIRTUALS (probe)) > ix)
2152 if (BINFO_VIRTUAL_P (probe))
2153 virtual_base = probe;
2156 /* Even if we find a virtual base, the correct delta is
2157 between the overrider and the binfo we're building a vtable
2159 goto virtual_covariant;
2162 /* Compute the constant adjustment to the `this' pointer. The
2163 `this' pointer, when this function is called, will point at BINFO
2164 (or one of its primary bases, which are at the same offset). */
2166 /* The `this' pointer needs to be adjusted from the declaration to
2167 the nearest virtual base. */
2168 delta = size_diffop (convert (ssizetype, BINFO_OFFSET (virtual_base)),
2169 convert (ssizetype, BINFO_OFFSET (first_defn)));
2171 /* If the nearest definition is in a lost primary, we don't need an
2172 entry in our vtable. Except possibly in a constructor vtable,
2173 if we happen to get our primary back. In that case, the offset
2174 will be zero, as it will be a primary base. */
2175 delta = size_zero_node;
2177 /* The `this' pointer needs to be adjusted from pointing to
2178 BINFO to pointing at the base where the final overrider
2181 delta = size_diffop (convert (ssizetype,
2182 BINFO_OFFSET (TREE_VALUE (overrider))),
2183 convert (ssizetype, BINFO_OFFSET (binfo)));
2185 modify_vtable_entry (t, binfo, overrider_fn, delta, virtuals);
2188 BV_VCALL_INDEX (*virtuals)
2189 = get_vcall_index (overrider_target, BINFO_TYPE (virtual_base));
2191 BV_VCALL_INDEX (*virtuals) = NULL_TREE;
2194 /* Called from modify_all_vtables via dfs_walk. */
2197 dfs_modify_vtables (tree binfo, void* data)
2199 tree t = (tree) data;
2204 if (!TYPE_CONTAINS_VPTR_P (BINFO_TYPE (binfo)))
2205 /* A base without a vtable needs no modification, and its bases
2206 are uninteresting. */
2207 return dfs_skip_bases;
2209 if (SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), t)
2210 && !CLASSTYPE_HAS_PRIMARY_BASE_P (t))
2211 /* Don't do the primary vtable, if it's new. */
2214 if (BINFO_PRIMARY_P (binfo) && !BINFO_VIRTUAL_P (binfo))
2215 /* There's no need to modify the vtable for a non-virtual primary
2216 base; we're not going to use that vtable anyhow. We do still
2217 need to do this for virtual primary bases, as they could become
2218 non-primary in a construction vtable. */
2221 make_new_vtable (t, binfo);
2223 /* Now, go through each of the virtual functions in the virtual
2224 function table for BINFO. Find the final overrider, and update
2225 the BINFO_VIRTUALS list appropriately. */
2226 for (ix = 0, virtuals = BINFO_VIRTUALS (binfo),
2227 old_virtuals = BINFO_VIRTUALS (TYPE_BINFO (BINFO_TYPE (binfo)));
2229 ix++, virtuals = TREE_CHAIN (virtuals),
2230 old_virtuals = TREE_CHAIN (old_virtuals))
2231 update_vtable_entry_for_fn (t,
2233 BV_FN (old_virtuals),
2239 /* Update all of the primary and secondary vtables for T. Create new
2240 vtables as required, and initialize their RTTI information. Each
2241 of the functions in VIRTUALS is declared in T and may override a
2242 virtual function from a base class; find and modify the appropriate
2243 entries to point to the overriding functions. Returns a list, in
2244 declaration order, of the virtual functions that are declared in T,
2245 but do not appear in the primary base class vtable, and which
2246 should therefore be appended to the end of the vtable for T. */
2249 modify_all_vtables (tree t, tree virtuals)
2251 tree binfo = TYPE_BINFO (t);
2254 /* Update all of the vtables. */
2255 dfs_walk_once (binfo, dfs_modify_vtables, NULL, t);
2257 /* Add virtual functions not already in our primary vtable. These
2258 will be both those introduced by this class, and those overridden
2259 from secondary bases. It does not include virtuals merely
2260 inherited from secondary bases. */
2261 for (fnsp = &virtuals; *fnsp; )
2263 tree fn = TREE_VALUE (*fnsp);
2265 if (!value_member (fn, BINFO_VIRTUALS (binfo))
2266 || DECL_VINDEX (fn) == error_mark_node)
2268 /* We don't need to adjust the `this' pointer when
2269 calling this function. */
2270 BV_DELTA (*fnsp) = integer_zero_node;
2271 BV_VCALL_INDEX (*fnsp) = NULL_TREE;
2273 /* This is a function not already in our vtable. Keep it. */
2274 fnsp = &TREE_CHAIN (*fnsp);
2277 /* We've already got an entry for this function. Skip it. */
2278 *fnsp = TREE_CHAIN (*fnsp);
2284 /* Get the base virtual function declarations in T that have the
2288 get_basefndecls (tree name, tree t)
2291 tree base_fndecls = NULL_TREE;
2292 int n_baseclasses = BINFO_N_BASE_BINFOS (TYPE_BINFO (t));
2295 /* Find virtual functions in T with the indicated NAME. */
2296 i = lookup_fnfields_1 (t, name);
2298 for (methods = VEC_index (tree, CLASSTYPE_METHOD_VEC (t), i);
2300 methods = OVL_NEXT (methods))
2302 tree method = OVL_CURRENT (methods);
2304 if (TREE_CODE (method) == FUNCTION_DECL
2305 && DECL_VINDEX (method))
2306 base_fndecls = tree_cons (NULL_TREE, method, base_fndecls);
2310 return base_fndecls;
2312 for (i = 0; i < n_baseclasses; i++)
2314 tree basetype = BINFO_TYPE (BINFO_BASE_BINFO (TYPE_BINFO (t), i));
2315 base_fndecls = chainon (get_basefndecls (name, basetype),
2319 return base_fndecls;
2322 /* If this declaration supersedes the declaration of
2323 a method declared virtual in the base class, then
2324 mark this field as being virtual as well. */
2327 check_for_override (tree decl, tree ctype)
2329 if (TREE_CODE (decl) == TEMPLATE_DECL)
2330 /* In [temp.mem] we have:
2332 A specialization of a member function template does not
2333 override a virtual function from a base class. */
2335 if ((DECL_DESTRUCTOR_P (decl)
2336 || IDENTIFIER_VIRTUAL_P (DECL_NAME (decl))
2337 || DECL_CONV_FN_P (decl))
2338 && look_for_overrides (ctype, decl)
2339 && !DECL_STATIC_FUNCTION_P (decl))
2340 /* Set DECL_VINDEX to a value that is neither an INTEGER_CST nor
2341 the error_mark_node so that we know it is an overriding
2343 DECL_VINDEX (decl) = decl;
2345 if (DECL_VIRTUAL_P (decl))
2347 if (!DECL_VINDEX (decl))
2348 DECL_VINDEX (decl) = error_mark_node;
2349 IDENTIFIER_VIRTUAL_P (DECL_NAME (decl)) = 1;
2353 /* Warn about hidden virtual functions that are not overridden in t.
2354 We know that constructors and destructors don't apply. */
2357 warn_hidden (tree t)
2359 VEC(tree,gc) *method_vec = CLASSTYPE_METHOD_VEC (t);
2363 /* We go through each separately named virtual function. */
2364 for (i = CLASSTYPE_FIRST_CONVERSION_SLOT;
2365 VEC_iterate (tree, method_vec, i, fns);
2376 /* All functions in this slot in the CLASSTYPE_METHOD_VEC will
2377 have the same name. Figure out what name that is. */
2378 name = DECL_NAME (OVL_CURRENT (fns));
2379 /* There are no possibly hidden functions yet. */
2380 base_fndecls = NULL_TREE;
2381 /* Iterate through all of the base classes looking for possibly
2382 hidden functions. */
2383 for (binfo = TYPE_BINFO (t), j = 0;
2384 BINFO_BASE_ITERATE (binfo, j, base_binfo); j++)
2386 tree basetype = BINFO_TYPE (base_binfo);
2387 base_fndecls = chainon (get_basefndecls (name, basetype),
2391 /* If there are no functions to hide, continue. */
2395 /* Remove any overridden functions. */
2396 for (fn = fns; fn; fn = OVL_NEXT (fn))
2398 fndecl = OVL_CURRENT (fn);
2399 if (DECL_VINDEX (fndecl))
2401 tree *prev = &base_fndecls;
2404 /* If the method from the base class has the same
2405 signature as the method from the derived class, it
2406 has been overridden. */
2407 if (same_signature_p (fndecl, TREE_VALUE (*prev)))
2408 *prev = TREE_CHAIN (*prev);
2410 prev = &TREE_CHAIN (*prev);
2414 /* Now give a warning for all base functions without overriders,
2415 as they are hidden. */
2416 while (base_fndecls)
2418 /* Here we know it is a hider, and no overrider exists. */
2419 warning (0, "%q+D was hidden", TREE_VALUE (base_fndecls));
2420 warning (0, " by %q+D", fns);
2421 base_fndecls = TREE_CHAIN (base_fndecls);
2426 /* Check for things that are invalid. There are probably plenty of other
2427 things we should check for also. */
2430 finish_struct_anon (tree t)
2434 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
2436 if (TREE_STATIC (field))
2438 if (TREE_CODE (field) != FIELD_DECL)
2441 if (DECL_NAME (field) == NULL_TREE
2442 && ANON_AGGR_TYPE_P (TREE_TYPE (field)))
2444 tree elt = TYPE_FIELDS (TREE_TYPE (field));
2445 for (; elt; elt = TREE_CHAIN (elt))
2447 /* We're generally only interested in entities the user
2448 declared, but we also find nested classes by noticing
2449 the TYPE_DECL that we create implicitly. You're
2450 allowed to put one anonymous union inside another,
2451 though, so we explicitly tolerate that. We use
2452 TYPE_ANONYMOUS_P rather than ANON_AGGR_TYPE_P so that
2453 we also allow unnamed types used for defining fields. */
2454 if (DECL_ARTIFICIAL (elt)
2455 && (!DECL_IMPLICIT_TYPEDEF_P (elt)
2456 || TYPE_ANONYMOUS_P (TREE_TYPE (elt))))
2459 if (TREE_CODE (elt) != FIELD_DECL)
2461 pedwarn ("%q+#D invalid; an anonymous union can "
2462 "only have non-static data members", elt);
2466 if (TREE_PRIVATE (elt))
2467 pedwarn ("private member %q+#D in anonymous union", elt);
2468 else if (TREE_PROTECTED (elt))
2469 pedwarn ("protected member %q+#D in anonymous union", elt);
2471 TREE_PRIVATE (elt) = TREE_PRIVATE (field);
2472 TREE_PROTECTED (elt) = TREE_PROTECTED (field);
2478 /* Add T to CLASSTYPE_DECL_LIST of current_class_type which
2479 will be used later during class template instantiation.
2480 When FRIEND_P is zero, T can be a static member data (VAR_DECL),
2481 a non-static member data (FIELD_DECL), a member function
2482 (FUNCTION_DECL), a nested type (RECORD_TYPE, ENUM_TYPE),
2483 a typedef (TYPE_DECL) or a member class template (TEMPLATE_DECL)
2484 When FRIEND_P is nonzero, T is either a friend class
2485 (RECORD_TYPE, TEMPLATE_DECL) or a friend function
2486 (FUNCTION_DECL, TEMPLATE_DECL). */
2489 maybe_add_class_template_decl_list (tree type, tree t, int friend_p)
2491 /* Save some memory by not creating TREE_LIST if TYPE is not template. */
2492 if (CLASSTYPE_TEMPLATE_INFO (type))
2493 CLASSTYPE_DECL_LIST (type)
2494 = tree_cons (friend_p ? NULL_TREE : type,
2495 t, CLASSTYPE_DECL_LIST (type));
2498 /* Create default constructors, assignment operators, and so forth for
2499 the type indicated by T, if they are needed. CANT_HAVE_CONST_CTOR,
2500 and CANT_HAVE_CONST_ASSIGNMENT are nonzero if, for whatever reason,
2501 the class cannot have a default constructor, copy constructor
2502 taking a const reference argument, or an assignment operator taking
2503 a const reference, respectively. */
2506 add_implicitly_declared_members (tree t,
2507 int cant_have_const_cctor,
2508 int cant_have_const_assignment)
2511 if (!CLASSTYPE_DESTRUCTORS (t))
2513 /* In general, we create destructors lazily. */
2514 CLASSTYPE_LAZY_DESTRUCTOR (t) = 1;
2515 /* However, if the implicit destructor is non-trivial
2516 destructor, we sometimes have to create it at this point. */
2517 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t))
2521 if (TYPE_FOR_JAVA (t))
2522 /* If this a Java class, any non-trivial destructor is
2523 invalid, even if compiler-generated. Therefore, if the
2524 destructor is non-trivial we create it now. */
2532 /* If the implicit destructor will be virtual, then we must
2533 generate it now because (unfortunately) we do not
2534 generate virtual tables lazily. */
2535 binfo = TYPE_BINFO (t);
2536 for (ix = 0; BINFO_BASE_ITERATE (binfo, ix, base_binfo); ix++)
2541 base_type = BINFO_TYPE (base_binfo);
2542 dtor = CLASSTYPE_DESTRUCTORS (base_type);
2543 if (dtor && DECL_VIRTUAL_P (dtor))
2551 /* If we can't get away with being lazy, generate the destructor
2554 lazily_declare_fn (sfk_destructor, t);
2558 /* Default constructor. */
2559 if (! TYPE_HAS_CONSTRUCTOR (t))
2561 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 1;
2562 CLASSTYPE_LAZY_DEFAULT_CTOR (t) = 1;
2565 /* Copy constructor. */
2566 if (! TYPE_HAS_INIT_REF (t) && ! TYPE_FOR_JAVA (t))
2568 TYPE_HAS_INIT_REF (t) = 1;
2569 TYPE_HAS_CONST_INIT_REF (t) = !cant_have_const_cctor;
2570 CLASSTYPE_LAZY_COPY_CTOR (t) = 1;
2571 TYPE_HAS_CONSTRUCTOR (t) = 1;
2574 /* If there is no assignment operator, one will be created if and
2575 when it is needed. For now, just record whether or not the type
2576 of the parameter to the assignment operator will be a const or
2577 non-const reference. */
2578 if (!TYPE_HAS_ASSIGN_REF (t) && !TYPE_FOR_JAVA (t))
2580 TYPE_HAS_ASSIGN_REF (t) = 1;
2581 TYPE_HAS_CONST_ASSIGN_REF (t) = !cant_have_const_assignment;
2582 CLASSTYPE_LAZY_ASSIGNMENT_OP (t) = 1;
2586 /* Subroutine of finish_struct_1. Recursively count the number of fields
2587 in TYPE, including anonymous union members. */
2590 count_fields (tree fields)
2594 for (x = fields; x; x = TREE_CHAIN (x))
2596 if (TREE_CODE (x) == FIELD_DECL && ANON_AGGR_TYPE_P (TREE_TYPE (x)))
2597 n_fields += count_fields (TYPE_FIELDS (TREE_TYPE (x)));
2604 /* Subroutine of finish_struct_1. Recursively add all the fields in the
2605 TREE_LIST FIELDS to the SORTED_FIELDS_TYPE elts, starting at offset IDX. */
2608 add_fields_to_record_type (tree fields, struct sorted_fields_type *field_vec, int idx)
2611 for (x = fields; x; x = TREE_CHAIN (x))
2613 if (TREE_CODE (x) == FIELD_DECL && ANON_AGGR_TYPE_P (TREE_TYPE (x)))
2614 idx = add_fields_to_record_type (TYPE_FIELDS (TREE_TYPE (x)), field_vec, idx);
2616 field_vec->elts[idx++] = x;
2621 /* FIELD is a bit-field. We are finishing the processing for its
2622 enclosing type. Issue any appropriate messages and set appropriate
2626 check_bitfield_decl (tree field)
2628 tree type = TREE_TYPE (field);
2631 /* Detect invalid bit-field type. */
2632 if (DECL_INITIAL (field)
2633 && ! INTEGRAL_TYPE_P (TREE_TYPE (field)))
2635 error ("bit-field %q+#D with non-integral type", field);
2636 w = error_mark_node;
2639 /* Detect and ignore out of range field width. */
2640 if (DECL_INITIAL (field))
2642 w = DECL_INITIAL (field);
2644 /* Avoid the non_lvalue wrapper added by fold for PLUS_EXPRs. */
2647 /* detect invalid field size. */
2648 w = integral_constant_value (w);
2650 if (TREE_CODE (w) != INTEGER_CST)
2652 error ("bit-field %q+D width not an integer constant", field);
2653 w = error_mark_node;
2655 else if (tree_int_cst_sgn (w) < 0)
2657 error ("negative width in bit-field %q+D", field);
2658 w = error_mark_node;
2660 else if (integer_zerop (w) && DECL_NAME (field) != 0)
2662 error ("zero width for bit-field %q+D", field);
2663 w = error_mark_node;
2665 else if (compare_tree_int (w, TYPE_PRECISION (type)) > 0
2666 && TREE_CODE (type) != ENUMERAL_TYPE
2667 && TREE_CODE (type) != BOOLEAN_TYPE)
2668 warning (0, "width of %q+D exceeds its type", field);
2669 else if (TREE_CODE (type) == ENUMERAL_TYPE
2670 && (0 > compare_tree_int (w,
2671 min_precision (TYPE_MIN_VALUE (type),
2672 TYPE_UNSIGNED (type)))
2673 || 0 > compare_tree_int (w,
2675 (TYPE_MAX_VALUE (type),
2676 TYPE_UNSIGNED (type)))))
2677 warning (0, "%q+D is too small to hold all values of %q#T", field, type);
2680 /* Remove the bit-field width indicator so that the rest of the
2681 compiler does not treat that value as an initializer. */
2682 DECL_INITIAL (field) = NULL_TREE;
2684 if (w != error_mark_node)
2686 DECL_SIZE (field) = convert (bitsizetype, w);
2687 DECL_BIT_FIELD (field) = 1;
2691 /* Non-bit-fields are aligned for their type. */
2692 DECL_BIT_FIELD (field) = 0;
2693 CLEAR_DECL_C_BIT_FIELD (field);
2697 /* FIELD is a non bit-field. We are finishing the processing for its
2698 enclosing type T. Issue any appropriate messages and set appropriate
2702 check_field_decl (tree field,
2704 int* cant_have_const_ctor,
2705 int* no_const_asn_ref,
2706 int* any_default_members)
2708 tree type = strip_array_types (TREE_TYPE (field));
2710 /* An anonymous union cannot contain any fields which would change
2711 the settings of CANT_HAVE_CONST_CTOR and friends. */
2712 if (ANON_UNION_TYPE_P (type))
2714 /* And, we don't set TYPE_HAS_CONST_INIT_REF, etc., for anonymous
2715 structs. So, we recurse through their fields here. */
2716 else if (ANON_AGGR_TYPE_P (type))
2720 for (fields = TYPE_FIELDS (type); fields; fields = TREE_CHAIN (fields))
2721 if (TREE_CODE (fields) == FIELD_DECL && !DECL_C_BIT_FIELD (field))
2722 check_field_decl (fields, t, cant_have_const_ctor,
2723 no_const_asn_ref, any_default_members);
2725 /* Check members with class type for constructors, destructors,
2727 else if (CLASS_TYPE_P (type))
2729 /* Never let anything with uninheritable virtuals
2730 make it through without complaint. */
2731 abstract_virtuals_error (field, type);
2733 if (TREE_CODE (t) == UNION_TYPE)
2735 if (TYPE_NEEDS_CONSTRUCTING (type))
2736 error ("member %q+#D with constructor not allowed in union",
2738 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
2739 error ("member %q+#D with destructor not allowed in union", field);
2740 if (TYPE_HAS_COMPLEX_ASSIGN_REF (type))
2741 error ("member %q+#D with copy assignment operator not allowed in union",
2746 TYPE_NEEDS_CONSTRUCTING (t) |= TYPE_NEEDS_CONSTRUCTING (type);
2747 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t)
2748 |= TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type);
2749 TYPE_HAS_COMPLEX_ASSIGN_REF (t) |= TYPE_HAS_COMPLEX_ASSIGN_REF (type);
2750 TYPE_HAS_COMPLEX_INIT_REF (t) |= TYPE_HAS_COMPLEX_INIT_REF (type);
2753 if (!TYPE_HAS_CONST_INIT_REF (type))
2754 *cant_have_const_ctor = 1;
2756 if (!TYPE_HAS_CONST_ASSIGN_REF (type))
2757 *no_const_asn_ref = 1;
2759 if (DECL_INITIAL (field) != NULL_TREE)
2761 /* `build_class_init_list' does not recognize
2763 if (TREE_CODE (t) == UNION_TYPE && any_default_members != 0)
2764 error ("multiple fields in union %qT initialized", t);
2765 *any_default_members = 1;
2769 /* Check the data members (both static and non-static), class-scoped
2770 typedefs, etc., appearing in the declaration of T. Issue
2771 appropriate diagnostics. Sets ACCESS_DECLS to a list (in
2772 declaration order) of access declarations; each TREE_VALUE in this
2773 list is a USING_DECL.
2775 In addition, set the following flags:
2778 The class is empty, i.e., contains no non-static data members.
2780 CANT_HAVE_CONST_CTOR_P
2781 This class cannot have an implicitly generated copy constructor
2782 taking a const reference.
2784 CANT_HAVE_CONST_ASN_REF
2785 This class cannot have an implicitly generated assignment
2786 operator taking a const reference.
2788 All of these flags should be initialized before calling this
2791 Returns a pointer to the end of the TYPE_FIELDs chain; additional
2792 fields can be added by adding to this chain. */
2795 check_field_decls (tree t, tree *access_decls,
2796 int *cant_have_const_ctor_p,
2797 int *no_const_asn_ref_p)
2802 int any_default_members;
2804 /* Assume there are no access declarations. */
2805 *access_decls = NULL_TREE;
2806 /* Assume this class has no pointer members. */
2807 has_pointers = false;
2808 /* Assume none of the members of this class have default
2810 any_default_members = 0;
2812 for (field = &TYPE_FIELDS (t); *field; field = next)
2815 tree type = TREE_TYPE (x);
2817 next = &TREE_CHAIN (x);
2819 if (TREE_CODE (x) == FIELD_DECL)
2821 if (TYPE_PACKED (t))
2823 if (!pod_type_p (TREE_TYPE (x)) && !TYPE_PACKED (TREE_TYPE (x)))
2826 "ignoring packed attribute on unpacked non-POD field %q+#D",
2828 else if (TYPE_ALIGN (TREE_TYPE (x)) > BITS_PER_UNIT)
2829 DECL_PACKED (x) = 1;
2832 if (DECL_C_BIT_FIELD (x) && integer_zerop (DECL_INITIAL (x)))
2833 /* We don't treat zero-width bitfields as making a class
2840 /* The class is non-empty. */
2841 CLASSTYPE_EMPTY_P (t) = 0;
2842 /* The class is not even nearly empty. */
2843 CLASSTYPE_NEARLY_EMPTY_P (t) = 0;
2844 /* If one of the data members contains an empty class,
2846 element_type = strip_array_types (type);
2847 if (CLASS_TYPE_P (element_type)
2848 && CLASSTYPE_CONTAINS_EMPTY_CLASS_P (element_type))
2849 CLASSTYPE_CONTAINS_EMPTY_CLASS_P (t) = 1;
2853 if (TREE_CODE (x) == USING_DECL)
2855 /* Prune the access declaration from the list of fields. */
2856 *field = TREE_CHAIN (x);
2858 /* Save the access declarations for our caller. */
2859 *access_decls = tree_cons (NULL_TREE, x, *access_decls);
2861 /* Since we've reset *FIELD there's no reason to skip to the
2867 if (TREE_CODE (x) == TYPE_DECL
2868 || TREE_CODE (x) == TEMPLATE_DECL)
2871 /* If we've gotten this far, it's a data member, possibly static,
2872 or an enumerator. */
2873 DECL_CONTEXT (x) = t;
2875 /* When this goes into scope, it will be a non-local reference. */
2876 DECL_NONLOCAL (x) = 1;
2878 if (TREE_CODE (t) == UNION_TYPE)
2882 If a union contains a static data member, or a member of
2883 reference type, the program is ill-formed. */
2884 if (TREE_CODE (x) == VAR_DECL)
2886 error ("%q+D may not be static because it is a member of a union", x);
2889 if (TREE_CODE (type) == REFERENCE_TYPE)
2891 error ("%q+D may not have reference type %qT because"
2892 " it is a member of a union",
2898 /* ``A local class cannot have static data members.'' ARM 9.4 */
2899 if (current_function_decl && TREE_STATIC (x))
2900 error ("field %q+D in local class cannot be static", x);
2902 /* Perform error checking that did not get done in
2904 if (TREE_CODE (type) == FUNCTION_TYPE)
2906 error ("field %q+D invalidly declared function type", x);
2907 type = build_pointer_type (type);
2908 TREE_TYPE (x) = type;
2910 else if (TREE_CODE (type) == METHOD_TYPE)
2912 error ("field %q+D invalidly declared method type", x);
2913 type = build_pointer_type (type);
2914 TREE_TYPE (x) = type;
2917 if (type == error_mark_node)
2920 if (TREE_CODE (x) == CONST_DECL || TREE_CODE (x) == VAR_DECL)
2923 /* Now it can only be a FIELD_DECL. */
2925 if (TREE_PRIVATE (x) || TREE_PROTECTED (x))
2926 CLASSTYPE_NON_AGGREGATE (t) = 1;
2928 /* If this is of reference type, check if it needs an init.
2929 Also do a little ANSI jig if necessary. */
2930 if (TREE_CODE (type) == REFERENCE_TYPE)
2932 CLASSTYPE_NON_POD_P (t) = 1;
2933 if (DECL_INITIAL (x) == NULL_TREE)
2934 SET_CLASSTYPE_REF_FIELDS_NEED_INIT (t, 1);
2936 /* ARM $12.6.2: [A member initializer list] (or, for an
2937 aggregate, initialization by a brace-enclosed list) is the
2938 only way to initialize nonstatic const and reference
2940 TYPE_HAS_COMPLEX_ASSIGN_REF (t) = 1;
2942 if (! TYPE_HAS_CONSTRUCTOR (t) && CLASSTYPE_NON_AGGREGATE (t)
2944 warning (0, "non-static reference %q+#D in class without a constructor", x);
2947 type = strip_array_types (type);
2949 /* This is used by -Weffc++ (see below). Warn only for pointers
2950 to members which might hold dynamic memory. So do not warn
2951 for pointers to functions or pointers to members. */
2952 if (TYPE_PTR_P (type)
2953 && !TYPE_PTRFN_P (type)
2954 && !TYPE_PTR_TO_MEMBER_P (type))
2955 has_pointers = true;
2957 if (CLASS_TYPE_P (type))
2959 if (CLASSTYPE_REF_FIELDS_NEED_INIT (type))
2960 SET_CLASSTYPE_REF_FIELDS_NEED_INIT (t, 1);
2961 if (CLASSTYPE_READONLY_FIELDS_NEED_INIT (type))
2962 SET_CLASSTYPE_READONLY_FIELDS_NEED_INIT (t, 1);
2965 if (DECL_MUTABLE_P (x) || TYPE_HAS_MUTABLE_P (type))
2966 CLASSTYPE_HAS_MUTABLE (t) = 1;
2968 if (! pod_type_p (type))
2969 /* DR 148 now allows pointers to members (which are POD themselves),
2970 to be allowed in POD structs. */
2971 CLASSTYPE_NON_POD_P (t) = 1;
2973 if (! zero_init_p (type))
2974 CLASSTYPE_NON_ZERO_INIT_P (t) = 1;
2976 /* If any field is const, the structure type is pseudo-const. */
2977 if (CP_TYPE_CONST_P (type))
2979 C_TYPE_FIELDS_READONLY (t) = 1;
2980 if (DECL_INITIAL (x) == NULL_TREE)
2981 SET_CLASSTYPE_READONLY_FIELDS_NEED_INIT (t, 1);
2983 /* ARM $12.6.2: [A member initializer list] (or, for an
2984 aggregate, initialization by a brace-enclosed list) is the
2985 only way to initialize nonstatic const and reference
2987 TYPE_HAS_COMPLEX_ASSIGN_REF (t) = 1;
2989 if (! TYPE_HAS_CONSTRUCTOR (t) && CLASSTYPE_NON_AGGREGATE (t)
2991 warning (0, "non-static const member %q+#D in class without a constructor", x);
2993 /* A field that is pseudo-const makes the structure likewise. */
2994 else if (CLASS_TYPE_P (type))
2996 C_TYPE_FIELDS_READONLY (t) |= C_TYPE_FIELDS_READONLY (type);
2997 SET_CLASSTYPE_READONLY_FIELDS_NEED_INIT (t,
2998 CLASSTYPE_READONLY_FIELDS_NEED_INIT (t)
2999 | CLASSTYPE_READONLY_FIELDS_NEED_INIT (type));
3002 /* Core issue 80: A nonstatic data member is required to have a
3003 different name from the class iff the class has a
3004 user-defined constructor. */
3005 if (constructor_name_p (DECL_NAME (x), t) && TYPE_HAS_CONSTRUCTOR (t))
3006 pedwarn ("field %q+#D with same name as class", x);
3008 /* We set DECL_C_BIT_FIELD in grokbitfield.
3009 If the type and width are valid, we'll also set DECL_BIT_FIELD. */
3010 if (DECL_C_BIT_FIELD (x))
3011 check_bitfield_decl (x);
3013 check_field_decl (x, t,
3014 cant_have_const_ctor_p,
3016 &any_default_members);
3019 /* Effective C++ rule 11: if a class has dynamic memory held by pointers,
3020 it should also define a copy constructor and an assignment operator to
3021 implement the correct copy semantic (deep vs shallow, etc.). As it is
3022 not feasible to check whether the constructors do allocate dynamic memory
3023 and store it within members, we approximate the warning like this:
3025 -- Warn only if there are members which are pointers
3026 -- Warn only if there is a non-trivial constructor (otherwise,
3027 there cannot be memory allocated).
3028 -- Warn only if there is a non-trivial destructor. We assume that the
3029 user at least implemented the cleanup correctly, and a destructor
3030 is needed to free dynamic memory.
3032 This seems enough for practical purposes. */
3035 && TYPE_HAS_CONSTRUCTOR (t)
3036 && TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t)
3037 && !(TYPE_HAS_INIT_REF (t) && TYPE_HAS_ASSIGN_REF (t)))
3039 warning (0, "%q#T has pointer data members", t);
3041 if (! TYPE_HAS_INIT_REF (t))
3043 warning (0, " but does not override %<%T(const %T&)%>", t, t);
3044 if (! TYPE_HAS_ASSIGN_REF (t))
3045 warning (0, " or %<operator=(const %T&)%>", t);
3047 else if (! TYPE_HAS_ASSIGN_REF (t))
3048 warning (0, " but does not override %<operator=(const %T&)%>", t);
3052 /* Check anonymous struct/anonymous union fields. */
3053 finish_struct_anon (t);
3055 /* We've built up the list of access declarations in reverse order.
3057 *access_decls = nreverse (*access_decls);
3060 /* If TYPE is an empty class type, records its OFFSET in the table of
3064 record_subobject_offset (tree type, tree offset, splay_tree offsets)
3068 if (!is_empty_class (type))
3071 /* Record the location of this empty object in OFFSETS. */
3072 n = splay_tree_lookup (offsets, (splay_tree_key) offset);
3074 n = splay_tree_insert (offsets,
3075 (splay_tree_key) offset,
3076 (splay_tree_value) NULL_TREE);
3077 n->value = ((splay_tree_value)
3078 tree_cons (NULL_TREE,
3085 /* Returns nonzero if TYPE is an empty class type and there is
3086 already an entry in OFFSETS for the same TYPE as the same OFFSET. */
3089 check_subobject_offset (tree type, tree offset, splay_tree offsets)
3094 if (!is_empty_class (type))
3097 /* Record the location of this empty object in OFFSETS. */
3098 n = splay_tree_lookup (offsets, (splay_tree_key) offset);
3102 for (t = (tree) n->value; t; t = TREE_CHAIN (t))
3103 if (same_type_p (TREE_VALUE (t), type))
3109 /* Walk through all the subobjects of TYPE (located at OFFSET). Call
3110 F for every subobject, passing it the type, offset, and table of
3111 OFFSETS. If VBASES_P is one, then virtual non-primary bases should
3114 If MAX_OFFSET is non-NULL, then subobjects with an offset greater
3115 than MAX_OFFSET will not be walked.
3117 If F returns a nonzero value, the traversal ceases, and that value
3118 is returned. Otherwise, returns zero. */
3121 walk_subobject_offsets (tree type,
3122 subobject_offset_fn f,
3129 tree type_binfo = NULL_TREE;
3131 /* If this OFFSET is bigger than the MAX_OFFSET, then we should
3133 if (max_offset && INT_CST_LT (max_offset, offset))
3136 if (type == error_mark_node)
3141 if (abi_version_at_least (2))
3143 type = BINFO_TYPE (type);
3146 if (CLASS_TYPE_P (type))
3152 /* Avoid recursing into objects that are not interesting. */
3153 if (!CLASSTYPE_CONTAINS_EMPTY_CLASS_P (type))
3156 /* Record the location of TYPE. */
3157 r = (*f) (type, offset, offsets);
3161 /* Iterate through the direct base classes of TYPE. */
3163 type_binfo = TYPE_BINFO (type);
3164 for (i = 0; BINFO_BASE_ITERATE (type_binfo, i, binfo); i++)
3168 if (abi_version_at_least (2)
3169 && BINFO_VIRTUAL_P (binfo))
3173 && BINFO_VIRTUAL_P (binfo)
3174 && !BINFO_PRIMARY_P (binfo))
3177 if (!abi_version_at_least (2))
3178 binfo_offset = size_binop (PLUS_EXPR,
3180 BINFO_OFFSET (binfo));
3184 /* We cannot rely on BINFO_OFFSET being set for the base
3185 class yet, but the offsets for direct non-virtual
3186 bases can be calculated by going back to the TYPE. */
3187 orig_binfo = BINFO_BASE_BINFO (TYPE_BINFO (type), i);
3188 binfo_offset = size_binop (PLUS_EXPR,
3190 BINFO_OFFSET (orig_binfo));
3193 r = walk_subobject_offsets (binfo,
3198 (abi_version_at_least (2)
3199 ? /*vbases_p=*/0 : vbases_p));
3204 if (abi_version_at_least (2) && CLASSTYPE_VBASECLASSES (type))
3207 VEC(tree,gc) *vbases;
3209 /* Iterate through the virtual base classes of TYPE. In G++
3210 3.2, we included virtual bases in the direct base class
3211 loop above, which results in incorrect results; the
3212 correct offsets for virtual bases are only known when
3213 working with the most derived type. */
3215 for (vbases = CLASSTYPE_VBASECLASSES (type), ix = 0;
3216 VEC_iterate (tree, vbases, ix, binfo); ix++)
3218 r = walk_subobject_offsets (binfo,
3220 size_binop (PLUS_EXPR,
3222 BINFO_OFFSET (binfo)),
3231 /* We still have to walk the primary base, if it is
3232 virtual. (If it is non-virtual, then it was walked
3234 tree vbase = get_primary_binfo (type_binfo);
3236 if (vbase && BINFO_VIRTUAL_P (vbase)
3237 && BINFO_PRIMARY_P (vbase)
3238 && BINFO_INHERITANCE_CHAIN (vbase) == type_binfo)
3240 r = (walk_subobject_offsets
3242 offsets, max_offset, /*vbases_p=*/0));
3249 /* Iterate through the fields of TYPE. */
3250 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
3251 if (TREE_CODE (field) == FIELD_DECL && !DECL_ARTIFICIAL (field))
3255 if (abi_version_at_least (2))
3256 field_offset = byte_position (field);
3258 /* In G++ 3.2, DECL_FIELD_OFFSET was used. */
3259 field_offset = DECL_FIELD_OFFSET (field);
3261 r = walk_subobject_offsets (TREE_TYPE (field),
3263 size_binop (PLUS_EXPR,
3273 else if (TREE_CODE (type) == ARRAY_TYPE)
3275 tree element_type = strip_array_types (type);
3276 tree domain = TYPE_DOMAIN (type);
3279 /* Avoid recursing into objects that are not interesting. */
3280 if (!CLASS_TYPE_P (element_type)
3281 || !CLASSTYPE_CONTAINS_EMPTY_CLASS_P (element_type))
3284 /* Step through each of the elements in the array. */
3285 for (index = size_zero_node;
3286 /* G++ 3.2 had an off-by-one error here. */
3287 (abi_version_at_least (2)
3288 ? !INT_CST_LT (TYPE_MAX_VALUE (domain), index)
3289 : INT_CST_LT (index, TYPE_MAX_VALUE (domain)));
3290 index = size_binop (PLUS_EXPR, index, size_one_node))
3292 r = walk_subobject_offsets (TREE_TYPE (type),
3300 offset = size_binop (PLUS_EXPR, offset,
3301 TYPE_SIZE_UNIT (TREE_TYPE (type)));
3302 /* If this new OFFSET is bigger than the MAX_OFFSET, then
3303 there's no point in iterating through the remaining
3304 elements of the array. */
3305 if (max_offset && INT_CST_LT (max_offset, offset))
3313 /* Record all of the empty subobjects of TYPE (either a type or a
3314 binfo). If IS_DATA_MEMBER is true, then a non-static data member
3315 is being placed at OFFSET; otherwise, it is a base class that is
3316 being placed at OFFSET. */
3319 record_subobject_offsets (tree type,
3322 bool is_data_member)
3325 /* If recording subobjects for a non-static data member or a
3326 non-empty base class , we do not need to record offsets beyond
3327 the size of the biggest empty class. Additional data members
3328 will go at the end of the class. Additional base classes will go
3329 either at offset zero (if empty, in which case they cannot
3330 overlap with offsets past the size of the biggest empty class) or
3331 at the end of the class.
3333 However, if we are placing an empty base class, then we must record
3334 all offsets, as either the empty class is at offset zero (where
3335 other empty classes might later be placed) or at the end of the
3336 class (where other objects might then be placed, so other empty
3337 subobjects might later overlap). */
3339 || !is_empty_class (BINFO_TYPE (type)))
3340 max_offset = sizeof_biggest_empty_class;
3342 max_offset = NULL_TREE;
3343 walk_subobject_offsets (type, record_subobject_offset, offset,
3344 offsets, max_offset, is_data_member);
3347 /* Returns nonzero if any of the empty subobjects of TYPE (located at
3348 OFFSET) conflict with entries in OFFSETS. If VBASES_P is nonzero,
3349 virtual bases of TYPE are examined. */
3352 layout_conflict_p (tree type,
3357 splay_tree_node max_node;
3359 /* Get the node in OFFSETS that indicates the maximum offset where
3360 an empty subobject is located. */
3361 max_node = splay_tree_max (offsets);
3362 /* If there aren't any empty subobjects, then there's no point in
3363 performing this check. */
3367 return walk_subobject_offsets (type, check_subobject_offset, offset,
3368 offsets, (tree) (max_node->key),
3372 /* DECL is a FIELD_DECL corresponding either to a base subobject of a
3373 non-static data member of the type indicated by RLI. BINFO is the
3374 binfo corresponding to the base subobject, OFFSETS maps offsets to
3375 types already located at those offsets. This function determines
3376 the position of the DECL. */
3379 layout_nonempty_base_or_field (record_layout_info rli,
3384 tree offset = NULL_TREE;
3390 /* For the purposes of determining layout conflicts, we want to
3391 use the class type of BINFO; TREE_TYPE (DECL) will be the
3392 CLASSTYPE_AS_BASE version, which does not contain entries for
3393 zero-sized bases. */
3394 type = TREE_TYPE (binfo);
3399 type = TREE_TYPE (decl);
3403 /* Try to place the field. It may take more than one try if we have
3404 a hard time placing the field without putting two objects of the
3405 same type at the same address. */
3408 struct record_layout_info_s old_rli = *rli;
3410 /* Place this field. */
3411 place_field (rli, decl);
3412 offset = byte_position (decl);
3414 /* We have to check to see whether or not there is already
3415 something of the same type at the offset we're about to use.
3416 For example, consider:
3419 struct T : public S { int i; };
3420 struct U : public S, public T {};
3422 Here, we put S at offset zero in U. Then, we can't put T at
3423 offset zero -- its S component would be at the same address
3424 as the S we already allocated. So, we have to skip ahead.
3425 Since all data members, including those whose type is an
3426 empty class, have nonzero size, any overlap can happen only
3427 with a direct or indirect base-class -- it can't happen with
3429 /* In a union, overlap is permitted; all members are placed at
3431 if (TREE_CODE (rli->t) == UNION_TYPE)
3433 /* G++ 3.2 did not check for overlaps when placing a non-empty
3435 if (!abi_version_at_least (2) && binfo && BINFO_VIRTUAL_P (binfo))
3437 if (layout_conflict_p (field_p ? type : binfo, offset,
3440 /* Strip off the size allocated to this field. That puts us
3441 at the first place we could have put the field with
3442 proper alignment. */
3445 /* Bump up by the alignment required for the type. */
3447 = size_binop (PLUS_EXPR, rli->bitpos,
3449 ? CLASSTYPE_ALIGN (type)
3450 : TYPE_ALIGN (type)));
3451 normalize_rli (rli);
3454 /* There was no conflict. We're done laying out this field. */
3458 /* Now that we know where it will be placed, update its
3460 if (binfo && CLASS_TYPE_P (BINFO_TYPE (binfo)))
3461 /* Indirect virtual bases may have a nonzero BINFO_OFFSET at
3462 this point because their BINFO_OFFSET is copied from another
3463 hierarchy. Therefore, we may not need to add the entire
3465 propagate_binfo_offsets (binfo,
3466 size_diffop (convert (ssizetype, offset),
3468 BINFO_OFFSET (binfo))));
3471 /* Returns true if TYPE is empty and OFFSET is nonzero. */
3474 empty_base_at_nonzero_offset_p (tree type,
3476 splay_tree offsets ATTRIBUTE_UNUSED)
3478 return is_empty_class (type) && !integer_zerop (offset);
3481 /* Layout the empty base BINFO. EOC indicates the byte currently just
3482 past the end of the class, and should be correctly aligned for a
3483 class of the type indicated by BINFO; OFFSETS gives the offsets of
3484 the empty bases allocated so far. T is the most derived
3485 type. Return nonzero iff we added it at the end. */
3488 layout_empty_base (tree binfo, tree eoc, splay_tree offsets)
3491 tree basetype = BINFO_TYPE (binfo);
3494 /* This routine should only be used for empty classes. */
3495 gcc_assert (is_empty_class (basetype));
3496 alignment = ssize_int (CLASSTYPE_ALIGN_UNIT (basetype));
3498 if (!integer_zerop (BINFO_OFFSET (binfo)))
3500 if (abi_version_at_least (2))
3501 propagate_binfo_offsets
3502 (binfo, size_diffop (size_zero_node, BINFO_OFFSET (binfo)));
3504 warning (0, "offset of empty base %qT may not be ABI-compliant and may"
3505 "change in a future version of GCC",
3506 BINFO_TYPE (binfo));
3509 /* This is an empty base class. We first try to put it at offset
3511 if (layout_conflict_p (binfo,
3512 BINFO_OFFSET (binfo),
3516 /* That didn't work. Now, we move forward from the next
3517 available spot in the class. */
3519 propagate_binfo_offsets (binfo, convert (ssizetype, eoc));
3522 if (!layout_conflict_p (binfo,
3523 BINFO_OFFSET (binfo),
3526 /* We finally found a spot where there's no overlap. */
3529 /* There's overlap here, too. Bump along to the next spot. */
3530 propagate_binfo_offsets (binfo, alignment);
3536 /* Layout the base given by BINFO in the class indicated by RLI.
3537 *BASE_ALIGN is a running maximum of the alignments of
3538 any base class. OFFSETS gives the location of empty base
3539 subobjects. T is the most derived type. Return nonzero if the new
3540 object cannot be nearly-empty. A new FIELD_DECL is inserted at
3541 *NEXT_FIELD, unless BINFO is for an empty base class.
3543 Returns the location at which the next field should be inserted. */
3546 build_base_field (record_layout_info rli, tree binfo,
3547 splay_tree offsets, tree *next_field)
3550 tree basetype = BINFO_TYPE (binfo);
3552 if (!COMPLETE_TYPE_P (basetype))
3553 /* This error is now reported in xref_tag, thus giving better
3554 location information. */
3557 /* Place the base class. */
3558 if (!is_empty_class (basetype))
3562 /* The containing class is non-empty because it has a non-empty
3564 CLASSTYPE_EMPTY_P (t) = 0;
3566 /* Create the FIELD_DECL. */
3567 decl = build_decl (FIELD_DECL, NULL_TREE, CLASSTYPE_AS_BASE (basetype));
3568 DECL_ARTIFICIAL (decl) = 1;
3569 DECL_IGNORED_P (decl) = 1;
3570 DECL_FIELD_CONTEXT (decl) = t;
3571 DECL_SIZE (decl) = CLASSTYPE_SIZE (basetype);
3572 DECL_SIZE_UNIT (decl) = CLASSTYPE_SIZE_UNIT (basetype);
3573 DECL_ALIGN (decl) = CLASSTYPE_ALIGN (basetype);
3574 DECL_USER_ALIGN (decl) = CLASSTYPE_USER_ALIGN (basetype);
3575 DECL_MODE (decl) = TYPE_MODE (basetype);
3576 DECL_FIELD_IS_BASE (decl) = 1;
3578 /* Try to place the field. It may take more than one try if we
3579 have a hard time placing the field without putting two
3580 objects of the same type at the same address. */
3581 layout_nonempty_base_or_field (rli, decl, binfo, offsets);
3582 /* Add the new FIELD_DECL to the list of fields for T. */
3583 TREE_CHAIN (decl) = *next_field;
3585 next_field = &TREE_CHAIN (decl);
3592 /* On some platforms (ARM), even empty classes will not be
3594 eoc = round_up (rli_size_unit_so_far (rli),
3595 CLASSTYPE_ALIGN_UNIT (basetype));
3596 atend = layout_empty_base (binfo, eoc, offsets);
3597 /* A nearly-empty class "has no proper base class that is empty,
3598 not morally virtual, and at an offset other than zero." */
3599 if (!BINFO_VIRTUAL_P (binfo) && CLASSTYPE_NEARLY_EMPTY_P (t))
3602 CLASSTYPE_NEARLY_EMPTY_P (t) = 0;
3603 /* The check above (used in G++ 3.2) is insufficient because
3604 an empty class placed at offset zero might itself have an
3605 empty base at a nonzero offset. */
3606 else if (walk_subobject_offsets (basetype,
3607 empty_base_at_nonzero_offset_p,
3610 /*max_offset=*/NULL_TREE,
3613 if (abi_version_at_least (2))
3614 CLASSTYPE_NEARLY_EMPTY_P (t) = 0;
3616 warning (0, "class %qT will be considered nearly empty in a "
3617 "future version of GCC", t);
3621 /* We do not create a FIELD_DECL for empty base classes because
3622 it might overlap some other field. We want to be able to
3623 create CONSTRUCTORs for the class by iterating over the
3624 FIELD_DECLs, and the back end does not handle overlapping
3627 /* An empty virtual base causes a class to be non-empty
3628 -- but in that case we do not need to clear CLASSTYPE_EMPTY_P
3629 here because that was already done when the virtual table
3630 pointer was created. */
3633 /* Record the offsets of BINFO and its base subobjects. */
3634 record_subobject_offsets (binfo,
3635 BINFO_OFFSET (binfo),
3637 /*is_data_member=*/false);
3642 /* Layout all of the non-virtual base classes. Record empty
3643 subobjects in OFFSETS. T is the most derived type. Return nonzero
3644 if the type cannot be nearly empty. The fields created
3645 corresponding to the base classes will be inserted at
3649 build_base_fields (record_layout_info rli,
3650 splay_tree offsets, tree *next_field)
3652 /* Chain to hold all the new FIELD_DECLs which stand in for base class
3655 int n_baseclasses = BINFO_N_BASE_BINFOS (TYPE_BINFO (t));
3658 /* The primary base class is always allocated first. */
3659 if (CLASSTYPE_HAS_PRIMARY_BASE_P (t))
3660 next_field = build_base_field (rli, CLASSTYPE_PRIMARY_BINFO (t),
3661 offsets, next_field);
3663 /* Now allocate the rest of the bases. */
3664 for (i = 0; i < n_baseclasses; ++i)
3668 base_binfo = BINFO_BASE_BINFO (TYPE_BINFO (t), i);
3670 /* The primary base was already allocated above, so we don't
3671 need to allocate it again here. */
3672 if (base_binfo == CLASSTYPE_PRIMARY_BINFO (t))
3675 /* Virtual bases are added at the end (a primary virtual base
3676 will have already been added). */
3677 if (BINFO_VIRTUAL_P (base_binfo))
3680 next_field = build_base_field (rli, base_binfo,
3681 offsets, next_field);
3685 /* Go through the TYPE_METHODS of T issuing any appropriate
3686 diagnostics, figuring out which methods override which other
3687 methods, and so forth. */
3690 check_methods (tree t)
3694 for (x = TYPE_METHODS (t); x; x = TREE_CHAIN (x))
3696 check_for_override (x, t);
3697 if (DECL_PURE_VIRTUAL_P (x) && ! DECL_VINDEX (x))
3698 error ("initializer specified for non-virtual method %q+D", x);
3699 /* The name of the field is the original field name
3700 Save this in auxiliary field for later overloading. */
3701 if (DECL_VINDEX (x))
3703 TYPE_POLYMORPHIC_P (t) = 1;
3704 if (DECL_PURE_VIRTUAL_P (x))
3705 VEC_safe_push (tree, gc, CLASSTYPE_PURE_VIRTUALS (t), x);
3707 /* All user-declared destructors are non-trivial. */
3708 if (DECL_DESTRUCTOR_P (x))
3709 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t) = 1;
3713 /* FN is a constructor or destructor. Clone the declaration to create
3714 a specialized in-charge or not-in-charge version, as indicated by
3718 build_clone (tree fn, tree name)
3723 /* Copy the function. */
3724 clone = copy_decl (fn);
3725 /* Remember where this function came from. */
3726 DECL_CLONED_FUNCTION (clone) = fn;
3727 DECL_ABSTRACT_ORIGIN (clone) = fn;
3728 /* Reset the function name. */
3729 DECL_NAME (clone) = name;
3730 SET_DECL_ASSEMBLER_NAME (clone, NULL_TREE);
3731 /* There's no pending inline data for this function. */
3732 DECL_PENDING_INLINE_INFO (clone) = NULL;
3733 DECL_PENDING_INLINE_P (clone) = 0;
3734 /* And it hasn't yet been deferred. */
3735 DECL_DEFERRED_FN (clone) = 0;
3737 /* The base-class destructor is not virtual. */
3738 if (name == base_dtor_identifier)
3740 DECL_VIRTUAL_P (clone) = 0;
3741 if (TREE_CODE (clone) != TEMPLATE_DECL)
3742 DECL_VINDEX (clone) = NULL_TREE;
3745 /* If there was an in-charge parameter, drop it from the function
3747 if (DECL_HAS_IN_CHARGE_PARM_P (clone))
3753 exceptions = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (clone));
3754 basetype = TYPE_METHOD_BASETYPE (TREE_TYPE (clone));
3755 parmtypes = TYPE_ARG_TYPES (TREE_TYPE (clone));
3756 /* Skip the `this' parameter. */
3757 parmtypes = TREE_CHAIN (parmtypes);
3758 /* Skip the in-charge parameter. */
3759 parmtypes = TREE_CHAIN (parmtypes);
3760 /* And the VTT parm, in a complete [cd]tor. */
3761 if (DECL_HAS_VTT_PARM_P (fn)
3762 && ! DECL_NEEDS_VTT_PARM_P (clone))
3763 parmtypes = TREE_CHAIN (parmtypes);
3764 /* If this is subobject constructor or destructor, add the vtt
3767 = build_method_type_directly (basetype,
3768 TREE_TYPE (TREE_TYPE (clone)),
3771 TREE_TYPE (clone) = build_exception_variant (TREE_TYPE (clone),
3774 = cp_build_type_attribute_variant (TREE_TYPE (clone),
3775 TYPE_ATTRIBUTES (TREE_TYPE (fn)));
3778 /* Copy the function parameters. But, DECL_ARGUMENTS on a TEMPLATE_DECL
3779 aren't function parameters; those are the template parameters. */
3780 if (TREE_CODE (clone) != TEMPLATE_DECL)
3782 DECL_ARGUMENTS (clone) = copy_list (DECL_ARGUMENTS (clone));
3783 /* Remove the in-charge parameter. */
3784 if (DECL_HAS_IN_CHARGE_PARM_P (clone))
3786 TREE_CHAIN (DECL_ARGUMENTS (clone))
3787 = TREE_CHAIN (TREE_CHAIN (DECL_ARGUMENTS (clone)));
3788 DECL_HAS_IN_CHARGE_PARM_P (clone) = 0;
3790 /* And the VTT parm, in a complete [cd]tor. */
3791 if (DECL_HAS_VTT_PARM_P (fn))
3793 if (DECL_NEEDS_VTT_PARM_P (clone))
3794 DECL_HAS_VTT_PARM_P (clone) = 1;
3797 TREE_CHAIN (DECL_ARGUMENTS (clone))
3798 = TREE_CHAIN (TREE_CHAIN (DECL_ARGUMENTS (clone)));
3799 DECL_HAS_VTT_PARM_P (clone) = 0;
3803 for (parms = DECL_ARGUMENTS (clone); parms; parms = TREE_CHAIN (parms))
3805 DECL_CONTEXT (parms) = clone;
3806 cxx_dup_lang_specific_decl (parms);
3810 /* Create the RTL for this function. */
3811 SET_DECL_RTL (clone, NULL_RTX);
3812 rest_of_decl_compilation (clone, /*top_level=*/1, at_eof);
3814 /* Make it easy to find the CLONE given the FN. */
3815 TREE_CHAIN (clone) = TREE_CHAIN (fn);
3816 TREE_CHAIN (fn) = clone;
3818 /* If this is a template, handle the DECL_TEMPLATE_RESULT as well. */
3819 if (TREE_CODE (clone) == TEMPLATE_DECL)
3823 DECL_TEMPLATE_RESULT (clone)
3824 = build_clone (DECL_TEMPLATE_RESULT (clone), name);
3825 result = DECL_TEMPLATE_RESULT (clone);
3826 DECL_TEMPLATE_INFO (result) = copy_node (DECL_TEMPLATE_INFO (result));
3827 DECL_TI_TEMPLATE (result) = clone;
3830 note_decl_for_pch (clone);
3835 /* Produce declarations for all appropriate clones of FN. If
3836 UPDATE_METHOD_VEC_P is nonzero, the clones are added to the
3837 CLASTYPE_METHOD_VEC as well. */
3840 clone_function_decl (tree fn, int update_method_vec_p)
3844 /* Avoid inappropriate cloning. */
3846 && DECL_CLONED_FUNCTION (TREE_CHAIN (fn)))
3849 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (fn))
3851 /* For each constructor, we need two variants: an in-charge version
3852 and a not-in-charge version. */
3853 clone = build_clone (fn, complete_ctor_identifier);
3854 if (update_method_vec_p)
3855 add_method (DECL_CONTEXT (clone), clone, NULL_TREE);
3856 clone = build_clone (fn, base_ctor_identifier);
3857 if (update_method_vec_p)
3858 add_method (DECL_CONTEXT (clone), clone, NULL_TREE);
3862 gcc_assert (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (fn));
3864 /* For each destructor, we need three variants: an in-charge
3865 version, a not-in-charge version, and an in-charge deleting
3866 version. We clone the deleting version first because that
3867 means it will go second on the TYPE_METHODS list -- and that
3868 corresponds to the correct layout order in the virtual
3871 For a non-virtual destructor, we do not build a deleting
3873 if (DECL_VIRTUAL_P (fn))
3875 clone = build_clone (fn, deleting_dtor_identifier);
3876 if (update_method_vec_p)
3877 add_method (DECL_CONTEXT (clone), clone, NULL_TREE);
3879 clone = build_clone (fn, complete_dtor_identifier);
3880 if (update_method_vec_p)
3881 add_method (DECL_CONTEXT (clone), clone, NULL_TREE);
3882 clone = build_clone (fn, base_dtor_identifier);
3883 if (update_method_vec_p)
3884 add_method (DECL_CONTEXT (clone), clone, NULL_TREE);
3887 /* Note that this is an abstract function that is never emitted. */
3888 DECL_ABSTRACT (fn) = 1;
3891 /* DECL is an in charge constructor, which is being defined. This will
3892 have had an in class declaration, from whence clones were
3893 declared. An out-of-class definition can specify additional default
3894 arguments. As it is the clones that are involved in overload
3895 resolution, we must propagate the information from the DECL to its
3899 adjust_clone_args (tree decl)
3903 for (clone = TREE_CHAIN (decl); clone && DECL_CLONED_FUNCTION (clone);
3904 clone = TREE_CHAIN (clone))
3906 tree orig_clone_parms = TYPE_ARG_TYPES (TREE_TYPE (clone));
3907 tree orig_decl_parms = TYPE_ARG_TYPES (TREE_TYPE (decl));
3908 tree decl_parms, clone_parms;
3910 clone_parms = orig_clone_parms;
3912 /* Skip the 'this' parameter. */
3913 orig_clone_parms = TREE_CHAIN (orig_clone_parms);
3914 orig_decl_parms = TREE_CHAIN (orig_decl_parms);
3916 if (DECL_HAS_IN_CHARGE_PARM_P (decl))
3917 orig_decl_parms = TREE_CHAIN (orig_decl_parms);
3918 if (DECL_HAS_VTT_PARM_P (decl))
3919 orig_decl_parms = TREE_CHAIN (orig_decl_parms);
3921 clone_parms = orig_clone_parms;
3922 if (DECL_HAS_VTT_PARM_P (clone))
3923 clone_parms = TREE_CHAIN (clone_parms);
3925 for (decl_parms = orig_decl_parms; decl_parms;
3926 decl_parms = TREE_CHAIN (decl_parms),
3927 clone_parms = TREE_CHAIN (clone_parms))
3929 gcc_assert (same_type_p (TREE_TYPE (decl_parms),
3930 TREE_TYPE (clone_parms)));
3932 if (TREE_PURPOSE (decl_parms) && !TREE_PURPOSE (clone_parms))
3934 /* A default parameter has been added. Adjust the
3935 clone's parameters. */
3936 tree exceptions = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (clone));
3937 tree basetype = TYPE_METHOD_BASETYPE (TREE_TYPE (clone));
3940 clone_parms = orig_decl_parms;
3942 if (DECL_HAS_VTT_PARM_P (clone))
3944 clone_parms = tree_cons (TREE_PURPOSE (orig_clone_parms),
3945 TREE_VALUE (orig_clone_parms),
3947 TREE_TYPE (clone_parms) = TREE_TYPE (orig_clone_parms);
3949 type = build_method_type_directly (basetype,
3950 TREE_TYPE (TREE_TYPE (clone)),
3953 type = build_exception_variant (type, exceptions);
3954 TREE_TYPE (clone) = type;
3956 clone_parms = NULL_TREE;
3960 gcc_assert (!clone_parms);
3964 /* For each of the constructors and destructors in T, create an
3965 in-charge and not-in-charge variant. */
3968 clone_constructors_and_destructors (tree t)
3972 /* If for some reason we don't have a CLASSTYPE_METHOD_VEC, we bail
3974 if (!CLASSTYPE_METHOD_VEC (t))
3977 for (fns = CLASSTYPE_CONSTRUCTORS (t); fns; fns = OVL_NEXT (fns))
3978 clone_function_decl (OVL_CURRENT (fns), /*update_method_vec_p=*/1);
3979 for (fns = CLASSTYPE_DESTRUCTORS (t); fns; fns = OVL_NEXT (fns))
3980 clone_function_decl (OVL_CURRENT (fns), /*update_method_vec_p=*/1);
3983 /* Remove all zero-width bit-fields from T. */
3986 remove_zero_width_bit_fields (tree t)
3990 fieldsp = &TYPE_FIELDS (t);
3993 if (TREE_CODE (*fieldsp) == FIELD_DECL
3994 && DECL_C_BIT_FIELD (*fieldsp)
3995 && DECL_INITIAL (*fieldsp))
3996 *fieldsp = TREE_CHAIN (*fieldsp);
3998 fieldsp = &TREE_CHAIN (*fieldsp);
4002 /* Returns TRUE iff we need a cookie when dynamically allocating an
4003 array whose elements have the indicated class TYPE. */
4006 type_requires_array_cookie (tree type)
4009 bool has_two_argument_delete_p = false;
4011 gcc_assert (CLASS_TYPE_P (type));
4013 /* If there's a non-trivial destructor, we need a cookie. In order
4014 to iterate through the array calling the destructor for each
4015 element, we'll have to know how many elements there are. */
4016 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
4019 /* If the usual deallocation function is a two-argument whose second
4020 argument is of type `size_t', then we have to pass the size of
4021 the array to the deallocation function, so we will need to store
4023 fns = lookup_fnfields (TYPE_BINFO (type),
4024 ansi_opname (VEC_DELETE_EXPR),
4026 /* If there are no `operator []' members, or the lookup is
4027 ambiguous, then we don't need a cookie. */
4028 if (!fns || fns == error_mark_node)
4030 /* Loop through all of the functions. */
4031 for (fns = BASELINK_FUNCTIONS (fns); fns; fns = OVL_NEXT (fns))
4036 /* Select the current function. */
4037 fn = OVL_CURRENT (fns);
4038 /* See if this function is a one-argument delete function. If
4039 it is, then it will be the usual deallocation function. */
4040 second_parm = TREE_CHAIN (TYPE_ARG_TYPES (TREE_TYPE (fn)));
4041 if (second_parm == void_list_node)
4043 /* Otherwise, if we have a two-argument function and the second
4044 argument is `size_t', it will be the usual deallocation
4045 function -- unless there is one-argument function, too. */
4046 if (TREE_CHAIN (second_parm) == void_list_node
4047 && same_type_p (TREE_VALUE (second_parm), sizetype))
4048 has_two_argument_delete_p = true;
4051 return has_two_argument_delete_p;
4054 /* Check the validity of the bases and members declared in T. Add any
4055 implicitly-generated functions (like copy-constructors and
4056 assignment operators). Compute various flag bits (like
4057 CLASSTYPE_NON_POD_T) for T. This routine works purely at the C++
4058 level: i.e., independently of the ABI in use. */
4061 check_bases_and_members (tree t)
4063 /* Nonzero if the implicitly generated copy constructor should take
4064 a non-const reference argument. */
4065 int cant_have_const_ctor;
4066 /* Nonzero if the implicitly generated assignment operator
4067 should take a non-const reference argument. */
4068 int no_const_asn_ref;
4071 /* By default, we use const reference arguments and generate default
4073 cant_have_const_ctor = 0;
4074 no_const_asn_ref = 0;
4076 /* Check all the base-classes. */
4077 check_bases (t, &cant_have_const_ctor,
4080 /* Check all the method declarations. */
4083 /* Check all the data member declarations. We cannot call
4084 check_field_decls until we have called check_bases check_methods,
4085 as check_field_decls depends on TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4086 being set appropriately. */
4087 check_field_decls (t, &access_decls,
4088 &cant_have_const_ctor,
4091 /* A nearly-empty class has to be vptr-containing; a nearly empty
4092 class contains just a vptr. */
4093 if (!TYPE_CONTAINS_VPTR_P (t))
4094 CLASSTYPE_NEARLY_EMPTY_P (t) = 0;
4096 /* Do some bookkeeping that will guide the generation of implicitly
4097 declared member functions. */
4098 TYPE_HAS_COMPLEX_INIT_REF (t)
4099 |= (TYPE_HAS_INIT_REF (t) || TYPE_CONTAINS_VPTR_P (t));
4100 TYPE_NEEDS_CONSTRUCTING (t)
4101 |= (TYPE_HAS_CONSTRUCTOR (t) || TYPE_CONTAINS_VPTR_P (t));
4102 CLASSTYPE_NON_AGGREGATE (t)
4103 |= (TYPE_HAS_CONSTRUCTOR (t) || TYPE_POLYMORPHIC_P (t));
4104 CLASSTYPE_NON_POD_P (t)
4105 |= (CLASSTYPE_NON_AGGREGATE (t)
4106 || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t)
4107 || TYPE_HAS_ASSIGN_REF (t));
4108 TYPE_HAS_COMPLEX_ASSIGN_REF (t)
4109 |= TYPE_HAS_ASSIGN_REF (t) || TYPE_CONTAINS_VPTR_P (t);
4111 /* Synthesize any needed methods. */
4112 add_implicitly_declared_members (t,
4113 cant_have_const_ctor,
4116 /* Create the in-charge and not-in-charge variants of constructors
4118 clone_constructors_and_destructors (t);
4120 /* Process the using-declarations. */
4121 for (; access_decls; access_decls = TREE_CHAIN (access_decls))
4122 handle_using_decl (TREE_VALUE (access_decls), t);
4124 /* Build and sort the CLASSTYPE_METHOD_VEC. */
4125 finish_struct_methods (t);
4127 /* Figure out whether or not we will need a cookie when dynamically
4128 allocating an array of this type. */
4129 TYPE_LANG_SPECIFIC (t)->u.c.vec_new_uses_cookie
4130 = type_requires_array_cookie (t);
4133 /* If T needs a pointer to its virtual function table, set TYPE_VFIELD
4134 accordingly. If a new vfield was created (because T doesn't have a
4135 primary base class), then the newly created field is returned. It
4136 is not added to the TYPE_FIELDS list; it is the caller's
4137 responsibility to do that. Accumulate declared virtual functions
4141 create_vtable_ptr (tree t, tree* virtuals_p)
4145 /* Collect the virtual functions declared in T. */
4146 for (fn = TYPE_METHODS (t); fn; fn = TREE_CHAIN (fn))
4147 if (DECL_VINDEX (fn) && !DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (fn)
4148 && TREE_CODE (DECL_VINDEX (fn)) != INTEGER_CST)
4150 tree new_virtual = make_node (TREE_LIST);
4152 BV_FN (new_virtual) = fn;
4153 BV_DELTA (new_virtual) = integer_zero_node;
4154 BV_VCALL_INDEX (new_virtual) = NULL_TREE;
4156 TREE_CHAIN (new_virtual) = *virtuals_p;
4157 *virtuals_p = new_virtual;
4160 /* If we couldn't find an appropriate base class, create a new field
4161 here. Even if there weren't any new virtual functions, we might need a
4162 new virtual function table if we're supposed to include vptrs in
4163 all classes that need them. */
4164 if (!TYPE_VFIELD (t) && (*virtuals_p || TYPE_CONTAINS_VPTR_P (t)))
4166 /* We build this decl with vtbl_ptr_type_node, which is a
4167 `vtable_entry_type*'. It might seem more precise to use
4168 `vtable_entry_type (*)[N]' where N is the number of virtual
4169 functions. However, that would require the vtable pointer in
4170 base classes to have a different type than the vtable pointer
4171 in derived classes. We could make that happen, but that
4172 still wouldn't solve all the problems. In particular, the
4173 type-based alias analysis code would decide that assignments
4174 to the base class vtable pointer can't alias assignments to
4175 the derived class vtable pointer, since they have different
4176 types. Thus, in a derived class destructor, where the base
4177 class constructor was inlined, we could generate bad code for
4178 setting up the vtable pointer.
4180 Therefore, we use one type for all vtable pointers. We still
4181 use a type-correct type; it's just doesn't indicate the array
4182 bounds. That's better than using `void*' or some such; it's
4183 cleaner, and it let's the alias analysis code know that these
4184 stores cannot alias stores to void*! */
4187 field = build_decl (FIELD_DECL, get_vfield_name (t), vtbl_ptr_type_node);
4188 DECL_VIRTUAL_P (field) = 1;
4189 DECL_ARTIFICIAL (field) = 1;
4190 DECL_FIELD_CONTEXT (field) = t;
4191 DECL_FCONTEXT (field) = t;
4193 TYPE_VFIELD (t) = field;
4195 /* This class is non-empty. */
4196 CLASSTYPE_EMPTY_P (t) = 0;
4204 /* Fixup the inline function given by INFO now that the class is
4208 fixup_pending_inline (tree fn)
4210 if (DECL_PENDING_INLINE_INFO (fn))
4212 tree args = DECL_ARGUMENTS (fn);
4215 DECL_CONTEXT (args) = fn;
4216 args = TREE_CHAIN (args);
4221 /* Fixup the inline methods and friends in TYPE now that TYPE is
4225 fixup_inline_methods (tree type)
4227 tree method = TYPE_METHODS (type);
4228 VEC(tree,gc) *friends;
4231 if (method && TREE_CODE (method) == TREE_VEC)
4233 if (TREE_VEC_ELT (method, 1))
4234 method = TREE_VEC_ELT (method, 1);
4235 else if (TREE_VEC_ELT (method, 0))
4236 method = TREE_VEC_ELT (method, 0);
4238 method = TREE_VEC_ELT (method, 2);
4241 /* Do inline member functions. */
4242 for (; method; method = TREE_CHAIN (method))
4243 fixup_pending_inline (method);
4246 for (friends = CLASSTYPE_INLINE_FRIENDS (type), ix = 0;
4247 VEC_iterate (tree, friends, ix, method); ix++)
4248 fixup_pending_inline (method);
4249 CLASSTYPE_INLINE_FRIENDS (type) = NULL;
4252 /* Add OFFSET to all base types of BINFO which is a base in the
4253 hierarchy dominated by T.
4255 OFFSET, which is a type offset, is number of bytes. */
4258 propagate_binfo_offsets (tree binfo, tree offset)
4264 /* Update BINFO's offset. */
4265 BINFO_OFFSET (binfo)
4266 = convert (sizetype,
4267 size_binop (PLUS_EXPR,
4268 convert (ssizetype, BINFO_OFFSET (binfo)),
4271 /* Find the primary base class. */
4272 primary_binfo = get_primary_binfo (binfo);
4274 if (primary_binfo && BINFO_INHERITANCE_CHAIN (primary_binfo) == binfo)
4275 propagate_binfo_offsets (primary_binfo, offset);
4277 /* Scan all of the bases, pushing the BINFO_OFFSET adjust
4279 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i)
4281 /* Don't do the primary base twice. */
4282 if (base_binfo == primary_binfo)
4285 if (BINFO_VIRTUAL_P (base_binfo))
4288 propagate_binfo_offsets (base_binfo, offset);
4292 /* Set BINFO_OFFSET for all of the virtual bases for RLI->T. Update
4293 TYPE_ALIGN and TYPE_SIZE for T. OFFSETS gives the location of
4294 empty subobjects of T. */
4297 layout_virtual_bases (record_layout_info rli, splay_tree offsets)
4301 bool first_vbase = true;
4304 if (BINFO_N_BASE_BINFOS (TYPE_BINFO (t)) == 0)
4307 if (!abi_version_at_least(2))
4309 /* In G++ 3.2, we incorrectly rounded the size before laying out
4310 the virtual bases. */
4311 finish_record_layout (rli, /*free_p=*/false);
4312 #ifdef STRUCTURE_SIZE_BOUNDARY
4313 /* Packed structures don't need to have minimum size. */
4314 if (! TYPE_PACKED (t))
4315 TYPE_ALIGN (t) = MAX (TYPE_ALIGN (t), (unsigned) STRUCTURE_SIZE_BOUNDARY);
4317 rli->offset = TYPE_SIZE_UNIT (t);
4318 rli->bitpos = bitsize_zero_node;
4319 rli->record_align = TYPE_ALIGN (t);
4322 /* Find the last field. The artificial fields created for virtual
4323 bases will go after the last extant field to date. */
4324 next_field = &TYPE_FIELDS (t);
4326 next_field = &TREE_CHAIN (*next_field);
4328 /* Go through the virtual bases, allocating space for each virtual
4329 base that is not already a primary base class. These are
4330 allocated in inheritance graph order. */
4331 for (vbase = TYPE_BINFO (t); vbase; vbase = TREE_CHAIN (vbase))
4333 if (!BINFO_VIRTUAL_P (vbase))
4336 if (!BINFO_PRIMARY_P (vbase))
4338 tree basetype = TREE_TYPE (vbase);
4340 /* This virtual base is not a primary base of any class in the
4341 hierarchy, so we have to add space for it. */
4342 next_field = build_base_field (rli, vbase,
4343 offsets, next_field);
4345 /* If the first virtual base might have been placed at a
4346 lower address, had we started from CLASSTYPE_SIZE, rather
4347 than TYPE_SIZE, issue a warning. There can be both false
4348 positives and false negatives from this warning in rare
4349 cases; to deal with all the possibilities would probably
4350 require performing both layout algorithms and comparing
4351 the results which is not particularly tractable. */
4355 (size_binop (CEIL_DIV_EXPR,
4356 round_up (CLASSTYPE_SIZE (t),
4357 CLASSTYPE_ALIGN (basetype)),
4359 BINFO_OFFSET (vbase))))
4360 warning (0, "offset of virtual base %qT is not ABI-compliant and "
4361 "may change in a future version of GCC",
4364 first_vbase = false;
4369 /* Returns the offset of the byte just past the end of the base class
4373 end_of_base (tree binfo)
4377 if (is_empty_class (BINFO_TYPE (binfo)))
4378 /* An empty class has zero CLASSTYPE_SIZE_UNIT, but we need to
4379 allocate some space for it. It cannot have virtual bases, so
4380 TYPE_SIZE_UNIT is fine. */
4381 size = TYPE_SIZE_UNIT (BINFO_TYPE (binfo));
4383 size = CLASSTYPE_SIZE_UNIT (BINFO_TYPE (binfo));
4385 return size_binop (PLUS_EXPR, BINFO_OFFSET (binfo), size);
4388 /* Returns the offset of the byte just past the end of the base class
4389 with the highest offset in T. If INCLUDE_VIRTUALS_P is zero, then
4390 only non-virtual bases are included. */
4393 end_of_class (tree t, int include_virtuals_p)
4395 tree result = size_zero_node;
4396 VEC(tree,gc) *vbases;
4402 for (binfo = TYPE_BINFO (t), i = 0;
4403 BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i)
4405 if (!include_virtuals_p
4406 && BINFO_VIRTUAL_P (base_binfo)
4407 && (!BINFO_PRIMARY_P (base_binfo)
4408 || BINFO_INHERITANCE_CHAIN (base_binfo) != TYPE_BINFO (t)))
4411 offset = end_of_base (base_binfo);
4412 if (INT_CST_LT_UNSIGNED (result, offset))
4416 /* G++ 3.2 did not check indirect virtual bases. */
4417 if (abi_version_at_least (2) && include_virtuals_p)
4418 for (vbases = CLASSTYPE_VBASECLASSES (t), i = 0;
4419 VEC_iterate (tree, vbases, i, base_binfo); i++)
4421 offset = end_of_base (base_binfo);
4422 if (INT_CST_LT_UNSIGNED (result, offset))
4429 /* Warn about bases of T that are inaccessible because they are
4430 ambiguous. For example:
4433 struct T : public S {};
4434 struct U : public S, public T {};
4436 Here, `(S*) new U' is not allowed because there are two `S'
4440 warn_about_ambiguous_bases (tree t)
4443 VEC(tree,gc) *vbases;
4448 /* If there are no repeated bases, nothing can be ambiguous. */
4449 if (!CLASSTYPE_REPEATED_BASE_P (t))
4452 /* Check direct bases. */
4453 for (binfo = TYPE_BINFO (t), i = 0;
4454 BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i)
4456 basetype = BINFO_TYPE (base_binfo);
4458 if (!lookup_base (t, basetype, ba_unique | ba_quiet, NULL))
4459 warning (0, "direct base %qT inaccessible in %qT due to ambiguity",
4463 /* Check for ambiguous virtual bases. */
4465 for (vbases = CLASSTYPE_VBASECLASSES (t), i = 0;
4466 VEC_iterate (tree, vbases, i, binfo); i++)
4468 basetype = BINFO_TYPE (binfo);
4470 if (!lookup_base (t, basetype, ba_unique | ba_quiet, NULL))
4471 warning (0, "virtual base %qT inaccessible in %qT due to ambiguity",
4476 /* Compare two INTEGER_CSTs K1 and K2. */
4479 splay_tree_compare_integer_csts (splay_tree_key k1, splay_tree_key k2)
4481 return tree_int_cst_compare ((tree) k1, (tree) k2);
4484 /* Increase the size indicated in RLI to account for empty classes
4485 that are "off the end" of the class. */
4488 include_empty_classes (record_layout_info rli)
4493 /* It might be the case that we grew the class to allocate a
4494 zero-sized base class. That won't be reflected in RLI, yet,
4495 because we are willing to overlay multiple bases at the same
4496 offset. However, now we need to make sure that RLI is big enough
4497 to reflect the entire class. */
4498 eoc = end_of_class (rli->t,
4499 CLASSTYPE_AS_BASE (rli->t) != NULL_TREE);
4500 rli_size = rli_size_unit_so_far (rli);
4501 if (TREE_CODE (rli_size) == INTEGER_CST
4502 && INT_CST_LT_UNSIGNED (rli_size, eoc))
4504 if (!abi_version_at_least (2))
4505 /* In version 1 of the ABI, the size of a class that ends with
4506 a bitfield was not rounded up to a whole multiple of a
4507 byte. Because rli_size_unit_so_far returns only the number
4508 of fully allocated bytes, any extra bits were not included
4510 rli->bitpos = round_down (rli->bitpos, BITS_PER_UNIT);
4512 /* The size should have been rounded to a whole byte. */
4513 gcc_assert (tree_int_cst_equal
4514 (rli->bitpos, round_down (rli->bitpos, BITS_PER_UNIT)));
4516 = size_binop (PLUS_EXPR,
4518 size_binop (MULT_EXPR,
4519 convert (bitsizetype,
4520 size_binop (MINUS_EXPR,
4522 bitsize_int (BITS_PER_UNIT)));
4523 normalize_rli (rli);
4527 /* Calculate the TYPE_SIZE, TYPE_ALIGN, etc for T. Calculate
4528 BINFO_OFFSETs for all of the base-classes. Position the vtable
4529 pointer. Accumulate declared virtual functions on VIRTUALS_P. */
4532 layout_class_type (tree t, tree *virtuals_p)
4534 tree non_static_data_members;
4537 record_layout_info rli;
4538 /* Maps offsets (represented as INTEGER_CSTs) to a TREE_LIST of
4539 types that appear at that offset. */
4540 splay_tree empty_base_offsets;
4541 /* True if the last field layed out was a bit-field. */
4542 bool last_field_was_bitfield = false;
4543 /* The location at which the next field should be inserted. */
4545 /* T, as a base class. */
4548 /* Keep track of the first non-static data member. */
4549 non_static_data_members = TYPE_FIELDS (t);
4551 /* Start laying out the record. */
4552 rli = start_record_layout (t);
4554 /* Mark all the primary bases in the hierarchy. */
4555 determine_primary_bases (t);
4557 /* Create a pointer to our virtual function table. */
4558 vptr = create_vtable_ptr (t, virtuals_p);
4560 /* The vptr is always the first thing in the class. */
4563 TREE_CHAIN (vptr) = TYPE_FIELDS (t);
4564 TYPE_FIELDS (t) = vptr;
4565 next_field = &TREE_CHAIN (vptr);
4566 place_field (rli, vptr);
4569 next_field = &TYPE_FIELDS (t);
4571 /* Build FIELD_DECLs for all of the non-virtual base-types. */
4572 empty_base_offsets = splay_tree_new (splay_tree_compare_integer_csts,
4574 build_base_fields (rli, empty_base_offsets, next_field);
4576 /* Layout the non-static data members. */
4577 for (field = non_static_data_members; field; field = TREE_CHAIN (field))
4582 /* We still pass things that aren't non-static data members to
4583 the back-end, in case it wants to do something with them. */
4584 if (TREE_CODE (field) != FIELD_DECL)
4586 place_field (rli, field);
4587 /* If the static data member has incomplete type, keep track
4588 of it so that it can be completed later. (The handling
4589 of pending statics in finish_record_layout is
4590 insufficient; consider:
4593 struct S2 { static S1 s1; };
4595 At this point, finish_record_layout will be called, but
4596 S1 is still incomplete.) */
4597 if (TREE_CODE (field) == VAR_DECL)
4599 maybe_register_incomplete_var (field);
4600 /* The visibility of static data members is determined
4601 at their point of declaration, not their point of
4603 determine_visibility (field);
4608 type = TREE_TYPE (field);
4610 padding = NULL_TREE;
4612 /* If this field is a bit-field whose width is greater than its
4613 type, then there are some special rules for allocating
4615 if (DECL_C_BIT_FIELD (field)
4616 && INT_CST_LT (TYPE_SIZE (type), DECL_SIZE (field)))
4618 integer_type_kind itk;
4620 bool was_unnamed_p = false;
4621 /* We must allocate the bits as if suitably aligned for the
4622 longest integer type that fits in this many bits. type
4623 of the field. Then, we are supposed to use the left over
4624 bits as additional padding. */
4625 for (itk = itk_char; itk != itk_none; ++itk)
4626 if (INT_CST_LT (DECL_SIZE (field),
4627 TYPE_SIZE (integer_types[itk])))
4630 /* ITK now indicates a type that is too large for the
4631 field. We have to back up by one to find the largest
4633 integer_type = integer_types[itk - 1];
4635 /* Figure out how much additional padding is required. GCC
4636 3.2 always created a padding field, even if it had zero
4638 if (!abi_version_at_least (2)
4639 || INT_CST_LT (TYPE_SIZE (integer_type), DECL_SIZE (field)))
4641 if (abi_version_at_least (2) && TREE_CODE (t) == UNION_TYPE)
4642 /* In a union, the padding field must have the full width
4643 of the bit-field; all fields start at offset zero. */
4644 padding = DECL_SIZE (field);
4647 if (warn_abi && TREE_CODE (t) == UNION_TYPE)
4648 warning (0, "size assigned to %qT may not be "
4649 "ABI-compliant and may change in a future "
4652 padding = size_binop (MINUS_EXPR, DECL_SIZE (field),
4653 TYPE_SIZE (integer_type));
4656 #ifdef PCC_BITFIELD_TYPE_MATTERS
4657 /* An unnamed bitfield does not normally affect the
4658 alignment of the containing class on a target where
4659 PCC_BITFIELD_TYPE_MATTERS. But, the C++ ABI does not
4660 make any exceptions for unnamed bitfields when the
4661 bitfields are longer than their types. Therefore, we
4662 temporarily give the field a name. */
4663 if (PCC_BITFIELD_TYPE_MATTERS && !DECL_NAME (field))
4665 was_unnamed_p = true;
4666 DECL_NAME (field) = make_anon_name ();
4669 DECL_SIZE (field) = TYPE_SIZE (integer_type);
4670 DECL_ALIGN (field) = TYPE_ALIGN (integer_type);
4671 DECL_USER_ALIGN (field) = TYPE_USER_ALIGN (integer_type);
4672 layout_nonempty_base_or_field (rli, field, NULL_TREE,
4673 empty_base_offsets);
4675 DECL_NAME (field) = NULL_TREE;
4676 /* Now that layout has been performed, set the size of the
4677 field to the size of its declared type; the rest of the
4678 field is effectively invisible. */
4679 DECL_SIZE (field) = TYPE_SIZE (type);
4680 /* We must also reset the DECL_MODE of the field. */
4681 if (abi_version_at_least (2))
4682 DECL_MODE (field) = TYPE_MODE (type);
4684 && DECL_MODE (field) != TYPE_MODE (type))
4685 /* Versions of G++ before G++ 3.4 did not reset the
4687 warning (0, "the offset of %qD may not be ABI-compliant and may "
4688 "change in a future version of GCC", field);
4691 layout_nonempty_base_or_field (rli, field, NULL_TREE,
4692 empty_base_offsets);
4694 /* Remember the location of any empty classes in FIELD. */
4695 if (abi_version_at_least (2))
4696 record_subobject_offsets (TREE_TYPE (field),
4697 byte_position(field),
4699 /*is_data_member=*/true);
4701 /* If a bit-field does not immediately follow another bit-field,
4702 and yet it starts in the middle of a byte, we have failed to
4703 comply with the ABI. */
4705 && DECL_C_BIT_FIELD (field)
4706 /* The TREE_NO_WARNING flag gets set by Objective-C when
4707 laying out an Objective-C class. The ObjC ABI differs
4708 from the C++ ABI, and so we do not want a warning
4710 && !TREE_NO_WARNING (field)
4711 && !last_field_was_bitfield
4712 && !integer_zerop (size_binop (TRUNC_MOD_EXPR,
4713 DECL_FIELD_BIT_OFFSET (field),
4714 bitsize_unit_node)))
4715 warning (0, "offset of %q+D is not ABI-compliant and may "
4716 "change in a future version of GCC", field);
4718 /* G++ used to use DECL_FIELD_OFFSET as if it were the byte
4719 offset of the field. */
4721 && !tree_int_cst_equal (DECL_FIELD_OFFSET (field),
4722 byte_position (field))
4723 && contains_empty_class_p (TREE_TYPE (field)))
4724 warning (0, "%q+D contains empty classes which may cause base "
4725 "classes to be placed at different locations in a "
4726 "future version of GCC", field);
4728 /* If we needed additional padding after this field, add it
4734 padding_field = build_decl (FIELD_DECL,
4737 DECL_BIT_FIELD (padding_field) = 1;
4738 DECL_SIZE (padding_field) = padding;
4739 DECL_CONTEXT (padding_field) = t;
4740 DECL_ARTIFICIAL (padding_field) = 1;
4741 DECL_IGNORED_P (padding_field) = 1;
4742 layout_nonempty_base_or_field (rli, padding_field,
4744 empty_base_offsets);
4747 last_field_was_bitfield = DECL_C_BIT_FIELD (field);
4750 if (abi_version_at_least (2) && !integer_zerop (rli->bitpos))
4752 /* Make sure that we are on a byte boundary so that the size of
4753 the class without virtual bases will always be a round number
4755 rli->bitpos = round_up (rli->bitpos, BITS_PER_UNIT);
4756 normalize_rli (rli);
4759 /* G++ 3.2 does not allow virtual bases to be overlaid with tail
4761 if (!abi_version_at_least (2))
4762 include_empty_classes(rli);
4764 /* Delete all zero-width bit-fields from the list of fields. Now
4765 that the type is laid out they are no longer important. */
4766 remove_zero_width_bit_fields (t);
4768 /* Create the version of T used for virtual bases. We do not use
4769 make_aggr_type for this version; this is an artificial type. For
4770 a POD type, we just reuse T. */
4771 if (CLASSTYPE_NON_POD_P (t) || CLASSTYPE_EMPTY_P (t))
4773 base_t = make_node (TREE_CODE (t));
4775 /* Set the size and alignment for the new type. In G++ 3.2, all
4776 empty classes were considered to have size zero when used as
4778 if (!abi_version_at_least (2) && CLASSTYPE_EMPTY_P (t))
4780 TYPE_SIZE (base_t) = bitsize_zero_node;
4781 TYPE_SIZE_UNIT (base_t) = size_zero_node;
4782 if (warn_abi && !integer_zerop (rli_size_unit_so_far (rli)))
4783 warning (0, "layout of classes derived from empty class %qT "
4784 "may change in a future version of GCC",
4791 /* If the ABI version is not at least two, and the last
4792 field was a bit-field, RLI may not be on a byte
4793 boundary. In particular, rli_size_unit_so_far might
4794 indicate the last complete byte, while rli_size_so_far
4795 indicates the total number of bits used. Therefore,
4796 rli_size_so_far, rather than rli_size_unit_so_far, is
4797 used to compute TYPE_SIZE_UNIT. */
4798 eoc = end_of_class (t, /*include_virtuals_p=*/0);
4799 TYPE_SIZE_UNIT (base_t)
4800 = size_binop (MAX_EXPR,
4802 size_binop (CEIL_DIV_EXPR,
4803 rli_size_so_far (rli),
4804 bitsize_int (BITS_PER_UNIT))),
4807 = size_binop (MAX_EXPR,
4808 rli_size_so_far (rli),
4809 size_binop (MULT_EXPR,
4810 convert (bitsizetype, eoc),
4811 bitsize_int (BITS_PER_UNIT)));
4813 TYPE_ALIGN (base_t) = rli->record_align;
4814 TYPE_USER_ALIGN (base_t) = TYPE_USER_ALIGN (t);
4816 /* Copy the fields from T. */
4817 next_field = &TYPE_FIELDS (base_t);
4818 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
4819 if (TREE_CODE (field) == FIELD_DECL)
4821 *next_field = build_decl (FIELD_DECL,
4824 DECL_CONTEXT (*next_field) = base_t;
4825 DECL_FIELD_OFFSET (*next_field) = DECL_FIELD_OFFSET (field);
4826 DECL_FIELD_BIT_OFFSET (*next_field)
4827 = DECL_FIELD_BIT_OFFSET (field);
4828 DECL_SIZE (*next_field) = DECL_SIZE (field);
4829 DECL_MODE (*next_field) = DECL_MODE (field);
4830 next_field = &TREE_CHAIN (*next_field);
4833 /* Record the base version of the type. */
4834 CLASSTYPE_AS_BASE (t) = base_t;
4835 TYPE_CONTEXT (base_t) = t;
4838 CLASSTYPE_AS_BASE (t) = t;
4840 /* Every empty class contains an empty class. */
4841 if (CLASSTYPE_EMPTY_P (t))
4842 CLASSTYPE_CONTAINS_EMPTY_CLASS_P (t) = 1;
4844 /* Set the TYPE_DECL for this type to contain the right
4845 value for DECL_OFFSET, so that we can use it as part
4846 of a COMPONENT_REF for multiple inheritance. */
4847 layout_decl (TYPE_MAIN_DECL (t), 0);
4849 /* Now fix up any virtual base class types that we left lying
4850 around. We must get these done before we try to lay out the
4851 virtual function table. As a side-effect, this will remove the
4852 base subobject fields. */
4853 layout_virtual_bases (rli, empty_base_offsets);
4855 /* Make sure that empty classes are reflected in RLI at this
4857 include_empty_classes(rli);
4859 /* Make sure not to create any structures with zero size. */
4860 if (integer_zerop (rli_size_unit_so_far (rli)) && CLASSTYPE_EMPTY_P (t))
4862 build_decl (FIELD_DECL, NULL_TREE, char_type_node));
4864 /* Let the back-end lay out the type. */
4865 finish_record_layout (rli, /*free_p=*/true);
4867 /* Warn about bases that can't be talked about due to ambiguity. */
4868 warn_about_ambiguous_bases (t);
4870 /* Now that we're done with layout, give the base fields the real types. */
4871 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
4872 if (DECL_ARTIFICIAL (field) && IS_FAKE_BASE_TYPE (TREE_TYPE (field)))
4873 TREE_TYPE (field) = TYPE_CONTEXT (TREE_TYPE (field));
4876 splay_tree_delete (empty_base_offsets);
4878 if (CLASSTYPE_EMPTY_P (t)
4879 && tree_int_cst_lt (sizeof_biggest_empty_class,
4880 TYPE_SIZE_UNIT (t)))
4881 sizeof_biggest_empty_class = TYPE_SIZE_UNIT (t);
4884 /* Determine the "key method" for the class type indicated by TYPE,
4885 and set CLASSTYPE_KEY_METHOD accordingly. */
4888 determine_key_method (tree type)
4892 if (TYPE_FOR_JAVA (type)
4893 || processing_template_decl
4894 || CLASSTYPE_TEMPLATE_INSTANTIATION (type)
4895 || CLASSTYPE_INTERFACE_KNOWN (type))
4898 /* The key method is the first non-pure virtual function that is not
4899 inline at the point of class definition. On some targets the
4900 key function may not be inline; those targets should not call
4901 this function until the end of the translation unit. */
4902 for (method = TYPE_METHODS (type); method != NULL_TREE;
4903 method = TREE_CHAIN (method))
4904 if (DECL_VINDEX (method) != NULL_TREE
4905 && ! DECL_DECLARED_INLINE_P (method)
4906 && ! DECL_PURE_VIRTUAL_P (method))
4908 CLASSTYPE_KEY_METHOD (type) = method;
4915 /* Perform processing required when the definition of T (a class type)
4919 finish_struct_1 (tree t)
4922 /* A TREE_LIST. The TREE_VALUE of each node is a FUNCTION_DECL. */
4923 tree virtuals = NULL_TREE;
4926 if (COMPLETE_TYPE_P (t))
4928 gcc_assert (IS_AGGR_TYPE (t));
4929 error ("redefinition of %q#T", t);
4934 /* If this type was previously laid out as a forward reference,
4935 make sure we lay it out again. */
4936 TYPE_SIZE (t) = NULL_TREE;
4937 CLASSTYPE_PRIMARY_BINFO (t) = NULL_TREE;
4939 fixup_inline_methods (t);
4941 /* Make assumptions about the class; we'll reset the flags if
4943 CLASSTYPE_EMPTY_P (t) = 1;
4944 CLASSTYPE_NEARLY_EMPTY_P (t) = 1;
4945 CLASSTYPE_CONTAINS_EMPTY_CLASS_P (t) = 0;
4947 /* Do end-of-class semantic processing: checking the validity of the
4948 bases and members and add implicitly generated methods. */
4949 check_bases_and_members (t);
4951 /* Find the key method. */
4952 if (TYPE_CONTAINS_VPTR_P (t))
4954 /* The Itanium C++ ABI permits the key method to be chosen when
4955 the class is defined -- even though the key method so
4956 selected may later turn out to be an inline function. On
4957 some systems (such as ARM Symbian OS) the key method cannot
4958 be determined until the end of the translation unit. On such
4959 systems, we leave CLASSTYPE_KEY_METHOD set to NULL, which
4960 will cause the class to be added to KEYED_CLASSES. Then, in
4961 finish_file we will determine the key method. */
4962 if (targetm.cxx.key_method_may_be_inline ())
4963 determine_key_method (t);
4965 /* If a polymorphic class has no key method, we may emit the vtable
4966 in every translation unit where the class definition appears. */
4967 if (CLASSTYPE_KEY_METHOD (t) == NULL_TREE)
4968 keyed_classes = tree_cons (NULL_TREE, t, keyed_classes);
4971 /* Layout the class itself. */
4972 layout_class_type (t, &virtuals);
4973 if (CLASSTYPE_AS_BASE (t) != t)
4974 /* We use the base type for trivial assignments, and hence it
4976 compute_record_mode (CLASSTYPE_AS_BASE (t));
4978 virtuals = modify_all_vtables (t, nreverse (virtuals));
4980 /* If necessary, create the primary vtable for this class. */
4981 if (virtuals || TYPE_CONTAINS_VPTR_P (t))
4983 /* We must enter these virtuals into the table. */
4984 if (!CLASSTYPE_HAS_PRIMARY_BASE_P (t))
4985 build_primary_vtable (NULL_TREE, t);
4986 else if (! BINFO_NEW_VTABLE_MARKED (TYPE_BINFO (t)))
4987 /* Here we know enough to change the type of our virtual
4988 function table, but we will wait until later this function. */
4989 build_primary_vtable (CLASSTYPE_PRIMARY_BINFO (t), t);
4992 if (TYPE_CONTAINS_VPTR_P (t))
4997 if (BINFO_VTABLE (TYPE_BINFO (t)))
4998 gcc_assert (DECL_VIRTUAL_P (BINFO_VTABLE (TYPE_BINFO (t))));
4999 if (!CLASSTYPE_HAS_PRIMARY_BASE_P (t))
5000 gcc_assert (BINFO_VIRTUALS (TYPE_BINFO (t)) == NULL_TREE);
5002 /* Add entries for virtual functions introduced by this class. */
5003 BINFO_VIRTUALS (TYPE_BINFO (t))
5004 = chainon (BINFO_VIRTUALS (TYPE_BINFO (t)), virtuals);
5006 /* Set DECL_VINDEX for all functions declared in this class. */
5007 for (vindex = 0, fn = BINFO_VIRTUALS (TYPE_BINFO (t));
5009 fn = TREE_CHAIN (fn),
5010 vindex += (TARGET_VTABLE_USES_DESCRIPTORS
5011 ? TARGET_VTABLE_USES_DESCRIPTORS : 1))
5013 tree fndecl = BV_FN (fn);
5015 if (DECL_THUNK_P (fndecl))
5016 /* A thunk. We should never be calling this entry directly
5017 from this vtable -- we'd use the entry for the non
5018 thunk base function. */
5019 DECL_VINDEX (fndecl) = NULL_TREE;
5020 else if (TREE_CODE (DECL_VINDEX (fndecl)) != INTEGER_CST)
5021 DECL_VINDEX (fndecl) = build_int_cst (NULL_TREE, vindex);
5025 finish_struct_bits (t);
5027 /* Complete the rtl for any static member objects of the type we're
5029 for (x = TYPE_FIELDS (t); x; x = TREE_CHAIN (x))
5030 if (TREE_CODE (x) == VAR_DECL && TREE_STATIC (x)
5031 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (x)), t))
5032 DECL_MODE (x) = TYPE_MODE (t);
5034 /* Done with FIELDS...now decide whether to sort these for
5035 faster lookups later.
5037 We use a small number because most searches fail (succeeding
5038 ultimately as the search bores through the inheritance
5039 hierarchy), and we want this failure to occur quickly. */
5041 n_fields = count_fields (TYPE_FIELDS (t));
5044 struct sorted_fields_type *field_vec = GGC_NEWVAR
5045 (struct sorted_fields_type,
5046 sizeof (struct sorted_fields_type) + n_fields * sizeof (tree));
5047 field_vec->len = n_fields;
5048 add_fields_to_record_type (TYPE_FIELDS (t), field_vec, 0);
5049 qsort (field_vec->elts, n_fields, sizeof (tree),
5051 if (! DECL_LANG_SPECIFIC (TYPE_MAIN_DECL (t)))
5052 retrofit_lang_decl (TYPE_MAIN_DECL (t));
5053 DECL_SORTED_FIELDS (TYPE_MAIN_DECL (t)) = field_vec;
5056 /* Make the rtl for any new vtables we have created, and unmark
5057 the base types we marked. */
5060 /* Build the VTT for T. */
5063 /* This warning does not make sense for Java classes, since they
5064 cannot have destructors. */
5065 if (!TYPE_FOR_JAVA (t) && warn_nonvdtor && TYPE_POLYMORPHIC_P (t))
5069 dtor = CLASSTYPE_DESTRUCTORS (t);
5070 /* Warn only if the dtor is non-private or the class has
5072 if (/* An implicitly declared destructor is always public. And,
5073 if it were virtual, we would have created it by now. */
5075 || (!DECL_VINDEX (dtor)
5076 && (!TREE_PRIVATE (dtor)
5077 || CLASSTYPE_FRIEND_CLASSES (t)
5078 || DECL_FRIENDLIST (TYPE_MAIN_DECL (t)))))
5079 warning (0, "%q#T has virtual functions but non-virtual destructor",
5085 if (warn_overloaded_virtual)
5088 /* Class layout, assignment of virtual table slots, etc., is now
5089 complete. Give the back end a chance to tweak the visibility of
5090 the class or perform any other required target modifications. */
5091 targetm.cxx.adjust_class_at_definition (t);
5093 maybe_suppress_debug_info (t);
5095 dump_class_hierarchy (t);
5097 /* Finish debugging output for this type. */
5098 rest_of_type_compilation (t, ! LOCAL_CLASS_P (t));
5101 /* When T was built up, the member declarations were added in reverse
5102 order. Rearrange them to declaration order. */
5105 unreverse_member_declarations (tree t)
5111 /* The following lists are all in reverse order. Put them in
5112 declaration order now. */
5113 TYPE_METHODS (t) = nreverse (TYPE_METHODS (t));
5114 CLASSTYPE_DECL_LIST (t) = nreverse (CLASSTYPE_DECL_LIST (t));
5116 /* Actually, for the TYPE_FIELDS, only the non TYPE_DECLs are in
5117 reverse order, so we can't just use nreverse. */
5119 for (x = TYPE_FIELDS (t);
5120 x && TREE_CODE (x) != TYPE_DECL;
5123 next = TREE_CHAIN (x);
5124 TREE_CHAIN (x) = prev;
5129 TREE_CHAIN (TYPE_FIELDS (t)) = x;
5131 TYPE_FIELDS (t) = prev;
5136 finish_struct (tree t, tree attributes)
5138 location_t saved_loc = input_location;
5140 /* Now that we've got all the field declarations, reverse everything
5142 unreverse_member_declarations (t);
5144 cplus_decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5146 /* Nadger the current location so that diagnostics point to the start of
5147 the struct, not the end. */
5148 input_location = DECL_SOURCE_LOCATION (TYPE_NAME (t));
5150 if (processing_template_decl)
5154 finish_struct_methods (t);
5155 TYPE_SIZE (t) = bitsize_zero_node;
5156 TYPE_SIZE_UNIT (t) = size_zero_node;
5158 /* We need to emit an error message if this type was used as a parameter
5159 and it is an abstract type, even if it is a template. We construct
5160 a simple CLASSTYPE_PURE_VIRTUALS list without taking bases into
5161 account and we call complete_vars with this type, which will check
5162 the PARM_DECLS. Note that while the type is being defined,
5163 CLASSTYPE_PURE_VIRTUALS contains the list of the inline friends
5164 (see CLASSTYPE_INLINE_FRIENDS) so we need to clear it. */
5165 CLASSTYPE_PURE_VIRTUALS (t) = NULL;
5166 for (x = TYPE_METHODS (t); x; x = TREE_CHAIN (x))
5167 if (DECL_PURE_VIRTUAL_P (x))
5168 VEC_safe_push (tree, gc, CLASSTYPE_PURE_VIRTUALS (t), x);
5172 finish_struct_1 (t);
5174 input_location = saved_loc;
5176 TYPE_BEING_DEFINED (t) = 0;
5178 if (current_class_type)
5181 error ("trying to finish struct, but kicked out due to previous parse errors");
5183 if (processing_template_decl && at_function_scope_p ())
5184 add_stmt (build_min (TAG_DEFN, t));
5189 /* Return the dynamic type of INSTANCE, if known.
5190 Used to determine whether the virtual function table is needed
5193 *NONNULL is set iff INSTANCE can be known to be nonnull, regardless
5194 of our knowledge of its type. *NONNULL should be initialized
5195 before this function is called. */
5198 fixed_type_or_null (tree instance, int* nonnull, int* cdtorp)
5200 switch (TREE_CODE (instance))
5203 if (POINTER_TYPE_P (TREE_TYPE (instance)))
5206 return fixed_type_or_null (TREE_OPERAND (instance, 0),
5210 /* This is a call to a constructor, hence it's never zero. */
5211 if (TREE_HAS_CONSTRUCTOR (instance))
5215 return TREE_TYPE (instance);
5220 /* This is a call to a constructor, hence it's never zero. */
5221 if (TREE_HAS_CONSTRUCTOR (instance))
5225 return TREE_TYPE (instance);
5227 return fixed_type_or_null (TREE_OPERAND (instance, 0), nonnull, cdtorp);
5231 if (TREE_CODE (TREE_OPERAND (instance, 0)) == ADDR_EXPR)
5232 return fixed_type_or_null (TREE_OPERAND (instance, 0), nonnull, cdtorp);
5233 if (TREE_CODE (TREE_OPERAND (instance, 1)) == INTEGER_CST)
5234 /* Propagate nonnull. */
5235 return fixed_type_or_null (TREE_OPERAND (instance, 0), nonnull, cdtorp);
5240 return fixed_type_or_null (TREE_OPERAND (instance, 0), nonnull, cdtorp);
5243 instance = TREE_OPERAND (instance, 0);
5246 /* Just because we see an ADDR_EXPR doesn't mean we're dealing
5247 with a real object -- given &p->f, p can still be null. */
5248 tree t = get_base_address (instance);
5249 /* ??? Probably should check DECL_WEAK here. */
5250 if (t && DECL_P (t))
5253 return fixed_type_or_null (instance, nonnull, cdtorp);
5256 /* If this component is really a base class reference, then the field
5257 itself isn't definitive. */
5258 if (DECL_FIELD_IS_BASE (TREE_OPERAND (instance, 1)))
5259 return fixed_type_or_null (TREE_OPERAND (instance, 0), nonnull, cdtorp);
5260 return fixed_type_or_null (TREE_OPERAND (instance, 1), nonnull, cdtorp);
5264 if (TREE_CODE (TREE_TYPE (instance)) == ARRAY_TYPE
5265 && IS_AGGR_TYPE (TREE_TYPE (TREE_TYPE (instance))))
5269 return TREE_TYPE (TREE_TYPE (instance));
5271 /* fall through... */
5275 if (IS_AGGR_TYPE (TREE_TYPE (instance)))
5279 return TREE_TYPE (instance);
5281 else if (instance == current_class_ptr)
5286 /* if we're in a ctor or dtor, we know our type. */
5287 if (DECL_LANG_SPECIFIC (current_function_decl)
5288 && (DECL_CONSTRUCTOR_P (current_function_decl)
5289 || DECL_DESTRUCTOR_P (current_function_decl)))
5293 return TREE_TYPE (TREE_TYPE (instance));
5296 else if (TREE_CODE (TREE_TYPE (instance)) == REFERENCE_TYPE)
5298 /* Reference variables should be references to objects. */
5302 /* DECL_VAR_MARKED_P is used to prevent recursion; a
5303 variable's initializer may refer to the variable
5305 if (TREE_CODE (instance) == VAR_DECL
5306 && DECL_INITIAL (instance)
5307 && !DECL_VAR_MARKED_P (instance))
5310 DECL_VAR_MARKED_P (instance) = 1;
5311 type = fixed_type_or_null (DECL_INITIAL (instance),
5313 DECL_VAR_MARKED_P (instance) = 0;
5324 /* Return nonzero if the dynamic type of INSTANCE is known, and
5325 equivalent to the static type. We also handle the case where
5326 INSTANCE is really a pointer. Return negative if this is a
5327 ctor/dtor. There the dynamic type is known, but this might not be
5328 the most derived base of the original object, and hence virtual
5329 bases may not be layed out according to this type.
5331 Used to determine whether the virtual function table is needed
5334 *NONNULL is set iff INSTANCE can be known to be nonnull, regardless
5335 of our knowledge of its type. *NONNULL should be initialized
5336 before this function is called. */
5339 resolves_to_fixed_type_p (tree instance, int* nonnull)
5341 tree t = TREE_TYPE (instance);
5344 tree fixed = fixed_type_or_null (instance, nonnull, &cdtorp);
5345 if (fixed == NULL_TREE)
5347 if (POINTER_TYPE_P (t))
5349 if (!same_type_ignoring_top_level_qualifiers_p (t, fixed))
5351 return cdtorp ? -1 : 1;
5356 init_class_processing (void)
5358 current_class_depth = 0;
5359 current_class_stack_size = 10;
5361 = xmalloc (current_class_stack_size * sizeof (struct class_stack_node));
5362 local_classes = VEC_alloc (tree, gc, 8);
5363 sizeof_biggest_empty_class = size_zero_node;
5365 ridpointers[(int) RID_PUBLIC] = access_public_node;
5366 ridpointers[(int) RID_PRIVATE] = access_private_node;
5367 ridpointers[(int) RID_PROTECTED] = access_protected_node;
5370 /* Restore the cached PREVIOUS_CLASS_LEVEL. */
5373 restore_class_cache (void)
5377 /* We are re-entering the same class we just left, so we don't
5378 have to search the whole inheritance matrix to find all the
5379 decls to bind again. Instead, we install the cached
5380 class_shadowed list and walk through it binding names. */
5381 push_binding_level (previous_class_level);
5382 class_binding_level = previous_class_level;
5383 /* Restore IDENTIFIER_TYPE_VALUE. */
5384 for (type = class_binding_level->type_shadowed;
5386 type = TREE_CHAIN (type))
5387 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (type), TREE_TYPE (type));
5390 /* Set global variables CURRENT_CLASS_NAME and CURRENT_CLASS_TYPE as
5391 appropriate for TYPE.
5393 So that we may avoid calls to lookup_name, we cache the _TYPE
5394 nodes of local TYPE_DECLs in the TREE_TYPE field of the name.
5396 For multiple inheritance, we perform a two-pass depth-first search
5397 of the type lattice. */
5400 pushclass (tree type)
5402 class_stack_node_t csn;
5404 type = TYPE_MAIN_VARIANT (type);
5406 /* Make sure there is enough room for the new entry on the stack. */
5407 if (current_class_depth + 1 >= current_class_stack_size)
5409 current_class_stack_size *= 2;
5411 = xrealloc (current_class_stack,
5412 current_class_stack_size
5413 * sizeof (struct class_stack_node));
5416 /* Insert a new entry on the class stack. */
5417 csn = current_class_stack + current_class_depth;
5418 csn->name = current_class_name;
5419 csn->type = current_class_type;
5420 csn->access = current_access_specifier;
5421 csn->names_used = 0;
5423 current_class_depth++;
5425 /* Now set up the new type. */
5426 current_class_name = TYPE_NAME (type);
5427 if (TREE_CODE (current_class_name) == TYPE_DECL)
5428 current_class_name = DECL_NAME (current_class_name);
5429 current_class_type = type;
5431 /* By default, things in classes are private, while things in
5432 structures or unions are public. */
5433 current_access_specifier = (CLASSTYPE_DECLARED_CLASS (type)
5434 ? access_private_node
5435 : access_public_node);
5437 if (previous_class_level
5438 && type != previous_class_level->this_entity
5439 && current_class_depth == 1)
5441 /* Forcibly remove any old class remnants. */
5442 invalidate_class_lookup_cache ();
5445 if (!previous_class_level
5446 || type != previous_class_level->this_entity
5447 || current_class_depth > 1)
5450 restore_class_cache ();
5453 /* When we exit a toplevel class scope, we save its binding level so
5454 that we can restore it quickly. Here, we've entered some other
5455 class, so we must invalidate our cache. */
5458 invalidate_class_lookup_cache (void)
5460 previous_class_level = NULL;
5463 /* Get out of the current class scope. If we were in a class scope
5464 previously, that is the one popped to. */
5471 current_class_depth--;
5472 current_class_name = current_class_stack[current_class_depth].name;
5473 current_class_type = current_class_stack[current_class_depth].type;
5474 current_access_specifier = current_class_stack[current_class_depth].access;
5475 if (current_class_stack[current_class_depth].names_used)
5476 splay_tree_delete (current_class_stack[current_class_depth].names_used);
5479 /* Mark the top of the class stack as hidden. */
5482 push_class_stack (void)
5484 if (current_class_depth)
5485 ++current_class_stack[current_class_depth - 1].hidden;
5488 /* Mark the top of the class stack as un-hidden. */
5491 pop_class_stack (void)
5493 if (current_class_depth)
5494 --current_class_stack[current_class_depth - 1].hidden;
5497 /* Returns 1 if current_class_type is either T or a nested type of T.
5498 We start looking from 1 because entry 0 is from global scope, and has
5502 currently_open_class (tree t)
5505 if (current_class_type && same_type_p (t, current_class_type))
5507 for (i = current_class_depth - 1; i > 0; --i)
5509 if (current_class_stack[i].hidden)
5511 if (current_class_stack[i].type
5512 && same_type_p (current_class_stack [i].type, t))
5518 /* If either current_class_type or one of its enclosing classes are derived
5519 from T, return the appropriate type. Used to determine how we found
5520 something via unqualified lookup. */
5523 currently_open_derived_class (tree t)
5527 /* The bases of a dependent type are unknown. */
5528 if (dependent_type_p (t))
5531 if (!current_class_type)
5534 if (DERIVED_FROM_P (t, current_class_type))
5535 return current_class_type;
5537 for (i = current_class_depth - 1; i > 0; --i)
5539 if (current_class_stack[i].hidden)
5541 if (DERIVED_FROM_P (t, current_class_stack[i].type))
5542 return current_class_stack[i].type;
5548 /* When entering a class scope, all enclosing class scopes' names with
5549 static meaning (static variables, static functions, types and
5550 enumerators) have to be visible. This recursive function calls
5551 pushclass for all enclosing class contexts until global or a local
5552 scope is reached. TYPE is the enclosed class. */
5555 push_nested_class (tree type)
5559 /* A namespace might be passed in error cases, like A::B:C. */
5560 if (type == NULL_TREE
5561 || type == error_mark_node
5562 || TREE_CODE (type) == NAMESPACE_DECL
5563 || ! IS_AGGR_TYPE (type)
5564 || TREE_CODE (type) == TEMPLATE_TYPE_PARM
5565 || TREE_CODE (type) == BOUND_TEMPLATE_TEMPLATE_PARM)
5568 context = DECL_CONTEXT (TYPE_MAIN_DECL (type));
5570 if (context && CLASS_TYPE_P (context))
5571 push_nested_class (context);
5575 /* Undoes a push_nested_class call. */
5578 pop_nested_class (void)
5580 tree context = DECL_CONTEXT (TYPE_MAIN_DECL (current_class_type));
5583 if (context && CLASS_TYPE_P (context))
5584 pop_nested_class ();
5587 /* Returns the number of extern "LANG" blocks we are nested within. */
5590 current_lang_depth (void)
5592 return VEC_length (tree, current_lang_base);
5595 /* Set global variables CURRENT_LANG_NAME to appropriate value
5596 so that behavior of name-mangling machinery is correct. */
5599 push_lang_context (tree name)
5601 VEC_safe_push (tree, gc, current_lang_base, current_lang_name);
5603 if (name == lang_name_cplusplus)
5605 current_lang_name = name;
5607 else if (name == lang_name_java)
5609 current_lang_name = name;
5610 /* DECL_IGNORED_P is initially set for these types, to avoid clutter.
5611 (See record_builtin_java_type in decl.c.) However, that causes
5612 incorrect debug entries if these types are actually used.
5613 So we re-enable debug output after extern "Java". */
5614 DECL_IGNORED_P (TYPE_NAME (java_byte_type_node)) = 0;
5615 DECL_IGNORED_P (TYPE_NAME (java_short_type_node)) = 0;
5616 DECL_IGNORED_P (TYPE_NAME (java_int_type_node)) = 0;
5617 DECL_IGNORED_P (TYPE_NAME (java_long_type_node)) = 0;
5618 DECL_IGNORED_P (TYPE_NAME (java_float_type_node)) = 0;
5619 DECL_IGNORED_P (TYPE_NAME (java_double_type_node)) = 0;
5620 DECL_IGNORED_P (TYPE_NAME (java_char_type_node)) = 0;
5621 DECL_IGNORED_P (TYPE_NAME (java_boolean_type_node)) = 0;
5623 else if (name == lang_name_c)
5625 current_lang_name = name;
5628 error ("language string %<\"%E\"%> not recognized", name);
5631 /* Get out of the current language scope. */
5634 pop_lang_context (void)
5636 current_lang_name = VEC_pop (tree, current_lang_base);
5639 /* Type instantiation routines. */
5641 /* Given an OVERLOAD and a TARGET_TYPE, return the function that
5642 matches the TARGET_TYPE. If there is no satisfactory match, return
5643 error_mark_node, and issue an error & warning messages under control
5644 of FLAGS. Permit pointers to member function if FLAGS permits. If
5645 TEMPLATE_ONLY, the name of the overloaded function was a
5646 template-id, and EXPLICIT_TARGS are the explicitly provided
5647 template arguments. */
5650 resolve_address_of_overloaded_function (tree target_type,
5652 tsubst_flags_t flags,
5654 tree explicit_targs)
5656 /* Here's what the standard says:
5660 If the name is a function template, template argument deduction
5661 is done, and if the argument deduction succeeds, the deduced
5662 arguments are used to generate a single template function, which
5663 is added to the set of overloaded functions considered.
5665 Non-member functions and static member functions match targets of
5666 type "pointer-to-function" or "reference-to-function." Nonstatic
5667 member functions match targets of type "pointer-to-member
5668 function;" the function type of the pointer to member is used to
5669 select the member function from the set of overloaded member
5670 functions. If a nonstatic member function is selected, the
5671 reference to the overloaded function name is required to have the
5672 form of a pointer to member as described in 5.3.1.
5674 If more than one function is selected, any template functions in
5675 the set are eliminated if the set also contains a non-template
5676 function, and any given template function is eliminated if the
5677 set contains a second template function that is more specialized
5678 than the first according to the partial ordering rules 14.5.5.2.
5679 After such eliminations, if any, there shall remain exactly one
5680 selected function. */
5683 int is_reference = 0;
5684 /* We store the matches in a TREE_LIST rooted here. The functions
5685 are the TREE_PURPOSE, not the TREE_VALUE, in this list, for easy
5686 interoperability with most_specialized_instantiation. */
5687 tree matches = NULL_TREE;
5690 /* By the time we get here, we should be seeing only real
5691 pointer-to-member types, not the internal POINTER_TYPE to
5692 METHOD_TYPE representation. */
5693 gcc_assert (TREE_CODE (target_type) != POINTER_TYPE
5694 || TREE_CODE (TREE_TYPE (target_type)) != METHOD_TYPE);
5696 gcc_assert (is_overloaded_fn (overload));
5698 /* Check that the TARGET_TYPE is reasonable. */
5699 if (TYPE_PTRFN_P (target_type))
5701 else if (TYPE_PTRMEMFUNC_P (target_type))
5702 /* This is OK, too. */
5704 else if (TREE_CODE (target_type) == FUNCTION_TYPE)
5706 /* This is OK, too. This comes from a conversion to reference
5708 target_type = build_reference_type (target_type);
5713 if (flags & tf_error)
5714 error ("cannot resolve overloaded function %qD based on"
5715 " conversion to type %qT",
5716 DECL_NAME (OVL_FUNCTION (overload)), target_type);
5717 return error_mark_node;
5720 /* If we can find a non-template function that matches, we can just
5721 use it. There's no point in generating template instantiations
5722 if we're just going to throw them out anyhow. But, of course, we
5723 can only do this when we don't *need* a template function. */
5728 for (fns = overload; fns; fns = OVL_NEXT (fns))
5730 tree fn = OVL_CURRENT (fns);
5733 if (TREE_CODE (fn) == TEMPLATE_DECL)
5734 /* We're not looking for templates just yet. */
5737 if ((TREE_CODE (TREE_TYPE (fn)) == METHOD_TYPE)
5739 /* We're looking for a non-static member, and this isn't
5740 one, or vice versa. */
5743 /* Ignore functions which haven't been explicitly
5745 if (DECL_ANTICIPATED (fn))
5748 /* See if there's a match. */
5749 fntype = TREE_TYPE (fn);
5751 fntype = build_ptrmemfunc_type (build_pointer_type (fntype));
5752 else if (!is_reference)
5753 fntype = build_pointer_type (fntype);
5755 if (can_convert_arg (target_type, fntype, fn, LOOKUP_NORMAL))
5756 matches = tree_cons (fn, NULL_TREE, matches);
5760 /* Now, if we've already got a match (or matches), there's no need
5761 to proceed to the template functions. But, if we don't have a
5762 match we need to look at them, too. */
5765 tree target_fn_type;
5766 tree target_arg_types;
5767 tree target_ret_type;
5772 = TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (target_type));
5774 target_fn_type = TREE_TYPE (target_type);
5775 target_arg_types = TYPE_ARG_TYPES (target_fn_type);
5776 target_ret_type = TREE_TYPE (target_fn_type);
5778 /* Never do unification on the 'this' parameter. */
5779 if (TREE_CODE (target_fn_type) == METHOD_TYPE)
5780 target_arg_types = TREE_CHAIN (target_arg_types);
5782 for (fns = overload; fns; fns = OVL_NEXT (fns))
5784 tree fn = OVL_CURRENT (fns);
5786 tree instantiation_type;
5789 if (TREE_CODE (fn) != TEMPLATE_DECL)
5790 /* We're only looking for templates. */
5793 if ((TREE_CODE (TREE_TYPE (fn)) == METHOD_TYPE)
5795 /* We're not looking for a non-static member, and this is
5796 one, or vice versa. */
5799 /* Try to do argument deduction. */
5800 targs = make_tree_vec (DECL_NTPARMS (fn));
5801 if (fn_type_unification (fn, explicit_targs, targs,
5802 target_arg_types, target_ret_type,
5803 DEDUCE_EXACT, LOOKUP_NORMAL))
5804 /* Argument deduction failed. */
5807 /* Instantiate the template. */
5808 instantiation = instantiate_template (fn, targs, flags);
5809 if (instantiation == error_mark_node)
5810 /* Instantiation failed. */
5813 /* See if there's a match. */
5814 instantiation_type = TREE_TYPE (instantiation);
5816 instantiation_type =
5817 build_ptrmemfunc_type (build_pointer_type (instantiation_type));
5818 else if (!is_reference)
5819 instantiation_type = build_pointer_type (instantiation_type);
5820 if (can_convert_arg (target_type, instantiation_type, instantiation,
5822 matches = tree_cons (instantiation, fn, matches);
5825 /* Now, remove all but the most specialized of the matches. */
5828 tree match = most_specialized_instantiation (matches);
5830 if (match != error_mark_node)
5831 matches = tree_cons (match, NULL_TREE, NULL_TREE);
5835 /* Now we should have exactly one function in MATCHES. */
5836 if (matches == NULL_TREE)
5838 /* There were *no* matches. */
5839 if (flags & tf_error)
5841 error ("no matches converting function %qD to type %q#T",
5842 DECL_NAME (OVL_FUNCTION (overload)),
5845 /* print_candidates expects a chain with the functions in
5846 TREE_VALUE slots, so we cons one up here (we're losing anyway,
5847 so why be clever?). */
5848 for (; overload; overload = OVL_NEXT (overload))
5849 matches = tree_cons (NULL_TREE, OVL_CURRENT (overload),
5852 print_candidates (matches);
5854 return error_mark_node;
5856 else if (TREE_CHAIN (matches))
5858 /* There were too many matches. */
5860 if (flags & tf_error)
5864 error ("converting overloaded function %qD to type %q#T is ambiguous",
5865 DECL_NAME (OVL_FUNCTION (overload)),
5868 /* Since print_candidates expects the functions in the
5869 TREE_VALUE slot, we flip them here. */
5870 for (match = matches; match; match = TREE_CHAIN (match))
5871 TREE_VALUE (match) = TREE_PURPOSE (match);
5873 print_candidates (matches);
5876 return error_mark_node;
5879 /* Good, exactly one match. Now, convert it to the correct type. */
5880 fn = TREE_PURPOSE (matches);
5882 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fn)
5883 && !(flags & tf_ptrmem_ok) && !flag_ms_extensions)
5885 static int explained;
5887 if (!(flags & tf_error))
5888 return error_mark_node;
5890 pedwarn ("assuming pointer to member %qD", fn);
5893 pedwarn ("(a pointer to member can only be formed with %<&%E%>)", fn);
5898 /* If we're doing overload resolution purely for the purpose of
5899 determining conversion sequences, we should not consider the
5900 function used. If this conversion sequence is selected, the
5901 function will be marked as used at this point. */
5902 if (!(flags & tf_conv))
5905 if (TYPE_PTRFN_P (target_type) || TYPE_PTRMEMFUNC_P (target_type))
5906 return build_unary_op (ADDR_EXPR, fn, 0);
5909 /* The target must be a REFERENCE_TYPE. Above, build_unary_op
5910 will mark the function as addressed, but here we must do it
5912 cxx_mark_addressable (fn);
5918 /* This function will instantiate the type of the expression given in
5919 RHS to match the type of LHSTYPE. If errors exist, then return
5920 error_mark_node. FLAGS is a bit mask. If TF_ERROR is set, then
5921 we complain on errors. If we are not complaining, never modify rhs,
5922 as overload resolution wants to try many possible instantiations, in
5923 the hope that at least one will work.
5925 For non-recursive calls, LHSTYPE should be a function, pointer to
5926 function, or a pointer to member function. */
5929 instantiate_type (tree lhstype, tree rhs, tsubst_flags_t flags)
5931 tsubst_flags_t flags_in = flags;
5933 flags &= ~tf_ptrmem_ok;
5935 if (TREE_CODE (lhstype) == UNKNOWN_TYPE)
5937 if (flags & tf_error)
5938 error ("not enough type information");
5939 return error_mark_node;
5942 if (TREE_TYPE (rhs) != NULL_TREE && ! (type_unknown_p (rhs)))
5944 if (same_type_p (lhstype, TREE_TYPE (rhs)))
5946 if (flag_ms_extensions
5947 && TYPE_PTRMEMFUNC_P (lhstype)
5948 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (rhs)))
5949 /* Microsoft allows `A::f' to be resolved to a
5950 pointer-to-member. */
5954 if (flags & tf_error)
5955 error ("argument of type %qT does not match %qT",
5956 TREE_TYPE (rhs), lhstype);
5957 return error_mark_node;
5961 if (TREE_CODE (rhs) == BASELINK)
5962 rhs = BASELINK_FUNCTIONS (rhs);
5964 /* If we are in a template, and have a NON_DEPENDENT_EXPR, we cannot
5965 deduce any type information. */
5966 if (TREE_CODE (rhs) == NON_DEPENDENT_EXPR)
5968 if (flags & tf_error)
5969 error ("not enough type information");
5970 return error_mark_node;
5973 /* We don't overwrite rhs if it is an overloaded function.
5974 Copying it would destroy the tree link. */
5975 if (TREE_CODE (rhs) != OVERLOAD)
5976 rhs = copy_node (rhs);
5978 /* This should really only be used when attempting to distinguish
5979 what sort of a pointer to function we have. For now, any
5980 arithmetic operation which is not supported on pointers
5981 is rejected as an error. */
5983 switch (TREE_CODE (rhs))
5996 new_rhs = instantiate_type (build_pointer_type (lhstype),
5997 TREE_OPERAND (rhs, 0), flags);
5998 if (new_rhs == error_mark_node)
5999 return error_mark_node;
6001 TREE_TYPE (rhs) = lhstype;
6002 TREE_OPERAND (rhs, 0) = new_rhs;
6007 rhs = copy_node (TREE_OPERAND (rhs, 0));
6008 TREE_TYPE (rhs) = unknown_type_node;
6009 return instantiate_type (lhstype, rhs, flags);
6013 tree member = TREE_OPERAND (rhs, 1);
6015 member = instantiate_type (lhstype, member, flags);
6016 if (member != error_mark_node
6017 && TREE_SIDE_EFFECTS (TREE_OPERAND (rhs, 0)))
6018 /* Do not lose object's side effects. */
6019 return build2 (COMPOUND_EXPR, TREE_TYPE (member),
6020 TREE_OPERAND (rhs, 0), member);
6025 rhs = TREE_OPERAND (rhs, 1);
6026 if (BASELINK_P (rhs))
6027 return instantiate_type (lhstype, BASELINK_FUNCTIONS (rhs), flags_in);
6029 /* This can happen if we are forming a pointer-to-member for a
6031 gcc_assert (TREE_CODE (rhs) == TEMPLATE_ID_EXPR);
6035 case TEMPLATE_ID_EXPR:
6037 tree fns = TREE_OPERAND (rhs, 0);
6038 tree args = TREE_OPERAND (rhs, 1);
6041 resolve_address_of_overloaded_function (lhstype, fns, flags_in,
6042 /*template_only=*/true,
6049 resolve_address_of_overloaded_function (lhstype, rhs, flags_in,
6050 /*template_only=*/false,
6051 /*explicit_targs=*/NULL_TREE);
6054 /* This is too hard for now. */
6060 TREE_OPERAND (rhs, 0)
6061 = instantiate_type (lhstype, TREE_OPERAND (rhs, 0), flags);
6062 if (TREE_OPERAND (rhs, 0) == error_mark_node)
6063 return error_mark_node;
6064 TREE_OPERAND (rhs, 1)
6065 = instantiate_type (lhstype, TREE_OPERAND (rhs, 1), flags);
6066 if (TREE_OPERAND (rhs, 1) == error_mark_node)
6067 return error_mark_node;
6069 TREE_TYPE (rhs) = lhstype;
6073 case TRUNC_DIV_EXPR:
6074 case FLOOR_DIV_EXPR:
6076 case ROUND_DIV_EXPR:
6078 case TRUNC_MOD_EXPR:
6079 case FLOOR_MOD_EXPR:
6081 case ROUND_MOD_EXPR:
6082 case FIX_ROUND_EXPR:
6083 case FIX_FLOOR_EXPR:
6085 case FIX_TRUNC_EXPR:
6100 case PREINCREMENT_EXPR:
6101 case PREDECREMENT_EXPR:
6102 case POSTINCREMENT_EXPR:
6103 case POSTDECREMENT_EXPR:
6104 if (flags & tf_error)
6105 error ("invalid operation on uninstantiated type");
6106 return error_mark_node;
6108 case TRUTH_AND_EXPR:
6110 case TRUTH_XOR_EXPR:
6117 case TRUTH_ANDIF_EXPR:
6118 case TRUTH_ORIF_EXPR:
6119 case TRUTH_NOT_EXPR:
6120 if (flags & tf_error)
6121 error ("not enough type information");
6122 return error_mark_node;
6125 if (type_unknown_p (TREE_OPERAND (rhs, 0)))
6127 if (flags & tf_error)
6128 error ("not enough type information");
6129 return error_mark_node;
6131 TREE_OPERAND (rhs, 1)
6132 = instantiate_type (lhstype, TREE_OPERAND (rhs, 1), flags);
6133 if (TREE_OPERAND (rhs, 1) == error_mark_node)
6134 return error_mark_node;
6135 TREE_OPERAND (rhs, 2)
6136 = instantiate_type (lhstype, TREE_OPERAND (rhs, 2), flags);
6137 if (TREE_OPERAND (rhs, 2) == error_mark_node)
6138 return error_mark_node;
6140 TREE_TYPE (rhs) = lhstype;
6144 TREE_OPERAND (rhs, 1)
6145 = instantiate_type (lhstype, TREE_OPERAND (rhs, 1), flags);
6146 if (TREE_OPERAND (rhs, 1) == error_mark_node)
6147 return error_mark_node;
6149 TREE_TYPE (rhs) = lhstype;
6154 if (PTRMEM_OK_P (rhs))
6155 flags |= tf_ptrmem_ok;
6157 return instantiate_type (lhstype, TREE_OPERAND (rhs, 0), flags);
6161 return error_mark_node;
6166 return error_mark_node;
6169 /* Return the name of the virtual function pointer field
6170 (as an IDENTIFIER_NODE) for the given TYPE. Note that
6171 this may have to look back through base types to find the
6172 ultimate field name. (For single inheritance, these could
6173 all be the same name. Who knows for multiple inheritance). */
6176 get_vfield_name (tree type)
6178 tree binfo, base_binfo;
6181 for (binfo = TYPE_BINFO (type);
6182 BINFO_N_BASE_BINFOS (binfo);
6185 base_binfo = BINFO_BASE_BINFO (binfo, 0);
6187 if (BINFO_VIRTUAL_P (base_binfo)
6188 || !TYPE_CONTAINS_VPTR_P (BINFO_TYPE (base_binfo)))
6192 type = BINFO_TYPE (binfo);
6193 buf = alloca (sizeof (VFIELD_NAME_FORMAT) + TYPE_NAME_LENGTH (type) + 2);
6194 sprintf (buf, VFIELD_NAME_FORMAT,
6195 IDENTIFIER_POINTER (constructor_name (type)));
6196 return get_identifier (buf);
6200 print_class_statistics (void)
6202 #ifdef GATHER_STATISTICS
6203 fprintf (stderr, "convert_harshness = %d\n", n_convert_harshness);
6204 fprintf (stderr, "compute_conversion_costs = %d\n", n_compute_conversion_costs);
6207 fprintf (stderr, "vtables = %d; vtable searches = %d\n",
6208 n_vtables, n_vtable_searches);
6209 fprintf (stderr, "vtable entries = %d; vtable elems = %d\n",
6210 n_vtable_entries, n_vtable_elems);
6215 /* Build a dummy reference to ourselves so Derived::Base (and A::A) works,
6216 according to [class]:
6217 The class-name is also inserted
6218 into the scope of the class itself. For purposes of access checking,
6219 the inserted class name is treated as if it were a public member name. */
6222 build_self_reference (void)
6224 tree name = constructor_name (current_class_type);
6225 tree value = build_lang_decl (TYPE_DECL, name, current_class_type);
6228 DECL_NONLOCAL (value) = 1;
6229 DECL_CONTEXT (value) = current_class_type;
6230 DECL_ARTIFICIAL (value) = 1;
6231 SET_DECL_SELF_REFERENCE_P (value);
6233 if (processing_template_decl)
6234 value = push_template_decl (value);
6236 saved_cas = current_access_specifier;
6237 current_access_specifier = access_public_node;
6238 finish_member_declaration (value);
6239 current_access_specifier = saved_cas;
6242 /* Returns 1 if TYPE contains only padding bytes. */
6245 is_empty_class (tree type)
6247 if (type == error_mark_node)
6250 if (! IS_AGGR_TYPE (type))
6253 /* In G++ 3.2, whether or not a class was empty was determined by
6254 looking at its size. */
6255 if (abi_version_at_least (2))
6256 return CLASSTYPE_EMPTY_P (type);
6258 return integer_zerop (CLASSTYPE_SIZE (type));
6261 /* Returns true if TYPE contains an empty class. */
6264 contains_empty_class_p (tree type)
6266 if (is_empty_class (type))
6268 if (CLASS_TYPE_P (type))
6275 for (binfo = TYPE_BINFO (type), i = 0;
6276 BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i)
6277 if (contains_empty_class_p (BINFO_TYPE (base_binfo)))
6279 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
6280 if (TREE_CODE (field) == FIELD_DECL
6281 && !DECL_ARTIFICIAL (field)
6282 && is_empty_class (TREE_TYPE (field)))
6285 else if (TREE_CODE (type) == ARRAY_TYPE)
6286 return contains_empty_class_p (TREE_TYPE (type));
6290 /* Note that NAME was looked up while the current class was being
6291 defined and that the result of that lookup was DECL. */
6294 maybe_note_name_used_in_class (tree name, tree decl)
6296 splay_tree names_used;
6298 /* If we're not defining a class, there's nothing to do. */
6299 if (!(innermost_scope_kind() == sk_class
6300 && TYPE_BEING_DEFINED (current_class_type)))
6303 /* If there's already a binding for this NAME, then we don't have
6304 anything to worry about. */
6305 if (lookup_member (current_class_type, name,
6306 /*protect=*/0, /*want_type=*/false))
6309 if (!current_class_stack[current_class_depth - 1].names_used)
6310 current_class_stack[current_class_depth - 1].names_used
6311 = splay_tree_new (splay_tree_compare_pointers, 0, 0);
6312 names_used = current_class_stack[current_class_depth - 1].names_used;
6314 splay_tree_insert (names_used,
6315 (splay_tree_key) name,
6316 (splay_tree_value) decl);
6319 /* Note that NAME was declared (as DECL) in the current class. Check
6320 to see that the declaration is valid. */
6323 note_name_declared_in_class (tree name, tree decl)
6325 splay_tree names_used;
6328 /* Look to see if we ever used this name. */
6330 = current_class_stack[current_class_depth - 1].names_used;
6334 n = splay_tree_lookup (names_used, (splay_tree_key) name);
6337 /* [basic.scope.class]
6339 A name N used in a class S shall refer to the same declaration
6340 in its context and when re-evaluated in the completed scope of
6342 error ("declaration of %q#D", decl);
6343 error ("changes meaning of %qD from %q+#D",
6344 DECL_NAME (OVL_CURRENT (decl)), (tree) n->value);
6348 /* Returns the VAR_DECL for the complete vtable associated with BINFO.
6349 Secondary vtables are merged with primary vtables; this function
6350 will return the VAR_DECL for the primary vtable. */
6353 get_vtbl_decl_for_binfo (tree binfo)
6357 decl = BINFO_VTABLE (binfo);
6358 if (decl && TREE_CODE (decl) == PLUS_EXPR)
6360 gcc_assert (TREE_CODE (TREE_OPERAND (decl, 0)) == ADDR_EXPR);
6361 decl = TREE_OPERAND (TREE_OPERAND (decl, 0), 0);
6364 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6369 /* Returns the binfo for the primary base of BINFO. If the resulting
6370 BINFO is a virtual base, and it is inherited elsewhere in the
6371 hierarchy, then the returned binfo might not be the primary base of
6372 BINFO in the complete object. Check BINFO_PRIMARY_P or
6373 BINFO_LOST_PRIMARY_P to be sure. */
6376 get_primary_binfo (tree binfo)
6381 primary_base = CLASSTYPE_PRIMARY_BINFO (BINFO_TYPE (binfo));
6385 result = copied_binfo (primary_base, binfo);
6389 /* If INDENTED_P is zero, indent to INDENT. Return nonzero. */
6392 maybe_indent_hierarchy (FILE * stream, int indent, int indented_p)
6395 fprintf (stream, "%*s", indent, "");
6399 /* Dump the offsets of all the bases rooted at BINFO to STREAM.
6400 INDENT should be zero when called from the top level; it is
6401 incremented recursively. IGO indicates the next expected BINFO in
6402 inheritance graph ordering. */
6405 dump_class_hierarchy_r (FILE *stream,
6415 indented = maybe_indent_hierarchy (stream, indent, 0);
6416 fprintf (stream, "%s (0x%lx) ",
6417 type_as_string (BINFO_TYPE (binfo), TFF_PLAIN_IDENTIFIER),
6418 (unsigned long) binfo);
6421 fprintf (stream, "alternative-path\n");
6424 igo = TREE_CHAIN (binfo);
6426 fprintf (stream, HOST_WIDE_INT_PRINT_DEC,
6427 tree_low_cst (BINFO_OFFSET (binfo), 0));
6428 if (is_empty_class (BINFO_TYPE (binfo)))
6429 fprintf (stream, " empty");
6430 else if (CLASSTYPE_NEARLY_EMPTY_P (BINFO_TYPE (binfo)))
6431 fprintf (stream, " nearly-empty");
6432 if (BINFO_VIRTUAL_P (binfo))
6433 fprintf (stream, " virtual");
6434 fprintf (stream, "\n");
6437 if (BINFO_PRIMARY_P (binfo))
6439 indented = maybe_indent_hierarchy (stream, indent + 3, indented);
6440 fprintf (stream, " primary-for %s (0x%lx)",
6441 type_as_string (BINFO_TYPE (BINFO_INHERITANCE_CHAIN (binfo)),
6442 TFF_PLAIN_IDENTIFIER),
6443 (unsigned long)BINFO_INHERITANCE_CHAIN (binfo));
6445 if (BINFO_LOST_PRIMARY_P (binfo))
6447 indented = maybe_indent_hierarchy (stream, indent + 3, indented);
6448 fprintf (stream, " lost-primary");
6451 fprintf (stream, "\n");
6453 if (!(flags & TDF_SLIM))
6457 if (BINFO_SUBVTT_INDEX (binfo))
6459 indented = maybe_indent_hierarchy (stream, indent + 3, indented);
6460 fprintf (stream, " subvttidx=%s",
6461 expr_as_string (BINFO_SUBVTT_INDEX (binfo),
6462 TFF_PLAIN_IDENTIFIER));
6464 if (BINFO_VPTR_INDEX (binfo))
6466 indented = maybe_indent_hierarchy (stream, indent + 3, indented);
6467 fprintf (stream, " vptridx=%s",
6468 expr_as_string (BINFO_VPTR_INDEX (binfo),
6469 TFF_PLAIN_IDENTIFIER));
6471 if (BINFO_VPTR_FIELD (binfo))
6473 indented = maybe_indent_hierarchy (stream, indent + 3, indented);
6474 fprintf (stream, " vbaseoffset=%s",
6475 expr_as_string (BINFO_VPTR_FIELD (binfo),
6476 TFF_PLAIN_IDENTIFIER));
6478 if (BINFO_VTABLE (binfo))
6480 indented = maybe_indent_hierarchy (stream, indent + 3, indented);
6481 fprintf (stream, " vptr=%s",
6482 expr_as_string (BINFO_VTABLE (binfo),
6483 TFF_PLAIN_IDENTIFIER));
6487 fprintf (stream, "\n");
6490 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
6491 igo = dump_class_hierarchy_r (stream, flags, base_binfo, igo, indent + 2);
6496 /* Dump the BINFO hierarchy for T. */
6499 dump_class_hierarchy_1 (FILE *stream, int flags, tree t)
6501 fprintf (stream, "Class %s\n", type_as_string (t, TFF_PLAIN_IDENTIFIER));
6502 fprintf (stream, " size=%lu align=%lu\n",
6503 (unsigned long)(tree_low_cst (TYPE_SIZE (t), 0) / BITS_PER_UNIT),
6504 (unsigned long)(TYPE_ALIGN (t) / BITS_PER_UNIT));
6505 fprintf (stream, " base size=%lu base align=%lu\n",
6506 (unsigned long)(tree_low_cst (TYPE_SIZE (CLASSTYPE_AS_BASE (t)), 0)
6508 (unsigned long)(TYPE_ALIGN (CLASSTYPE_AS_BASE (t))
6510 dump_class_hierarchy_r (stream, flags, TYPE_BINFO (t), TYPE_BINFO (t), 0);
6511 fprintf (stream, "\n");
6514 /* Debug interface to hierarchy dumping. */
6517 debug_class (tree t)
6519 dump_class_hierarchy_1 (stderr, TDF_SLIM, t);
6523 dump_class_hierarchy (tree t)
6526 FILE *stream = dump_begin (TDI_class, &flags);
6530 dump_class_hierarchy_1 (stream, flags, t);
6531 dump_end (TDI_class, stream);
6536 dump_array (FILE * stream, tree decl)
6539 unsigned HOST_WIDE_INT ix;
6541 tree size = TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (decl)));
6543 elt = (tree_low_cst (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl))), 0)
6545 fprintf (stream, "%s:", decl_as_string (decl, TFF_PLAIN_IDENTIFIER));
6546 fprintf (stream, " %s entries",
6547 expr_as_string (size_binop (PLUS_EXPR, size, size_one_node),
6548 TFF_PLAIN_IDENTIFIER));
6549 fprintf (stream, "\n");
6551 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)),
6553 fprintf (stream, "%-4ld %s\n", (long)(ix * elt),
6554 expr_as_string (value, TFF_PLAIN_IDENTIFIER));
6558 dump_vtable (tree t, tree binfo, tree vtable)
6561 FILE *stream = dump_begin (TDI_class, &flags);
6566 if (!(flags & TDF_SLIM))
6568 int ctor_vtbl_p = TYPE_BINFO (t) != binfo;
6570 fprintf (stream, "%s for %s",
6571 ctor_vtbl_p ? "Construction vtable" : "Vtable",
6572 type_as_string (BINFO_TYPE (binfo), TFF_PLAIN_IDENTIFIER));
6575 if (!BINFO_VIRTUAL_P (binfo))
6576 fprintf (stream, " (0x%lx instance)", (unsigned long)binfo);
6577 fprintf (stream, " in %s", type_as_string (t, TFF_PLAIN_IDENTIFIER));
6579 fprintf (stream, "\n");
6580 dump_array (stream, vtable);
6581 fprintf (stream, "\n");
6584 dump_end (TDI_class, stream);
6588 dump_vtt (tree t, tree vtt)
6591 FILE *stream = dump_begin (TDI_class, &flags);
6596 if (!(flags & TDF_SLIM))
6598 fprintf (stream, "VTT for %s\n",
6599 type_as_string (t, TFF_PLAIN_IDENTIFIER));
6600 dump_array (stream, vtt);
6601 fprintf (stream, "\n");
6604 dump_end (TDI_class, stream);
6607 /* Dump a function or thunk and its thunkees. */
6610 dump_thunk (FILE *stream, int indent, tree thunk)
6612 static const char spaces[] = " ";
6613 tree name = DECL_NAME (thunk);
6616 fprintf (stream, "%.*s%p %s %s", indent, spaces,
6618 !DECL_THUNK_P (thunk) ? "function"
6619 : DECL_THIS_THUNK_P (thunk) ? "this-thunk" : "covariant-thunk",
6620 name ? IDENTIFIER_POINTER (name) : "<unset>");
6621 if (DECL_THUNK_P (thunk))
6623 HOST_WIDE_INT fixed_adjust = THUNK_FIXED_OFFSET (thunk);
6624 tree virtual_adjust = THUNK_VIRTUAL_OFFSET (thunk);
6626 fprintf (stream, " fixed=" HOST_WIDE_INT_PRINT_DEC, fixed_adjust);
6627 if (!virtual_adjust)
6629 else if (DECL_THIS_THUNK_P (thunk))
6630 fprintf (stream, " vcall=" HOST_WIDE_INT_PRINT_DEC,
6631 tree_low_cst (virtual_adjust, 0));
6633 fprintf (stream, " vbase=" HOST_WIDE_INT_PRINT_DEC "(%s)",
6634 tree_low_cst (BINFO_VPTR_FIELD (virtual_adjust), 0),
6635 type_as_string (BINFO_TYPE (virtual_adjust), TFF_SCOPE));
6636 if (THUNK_ALIAS (thunk))
6637 fprintf (stream, " alias to %p", (void *)THUNK_ALIAS (thunk));
6639 fprintf (stream, "\n");
6640 for (thunks = DECL_THUNKS (thunk); thunks; thunks = TREE_CHAIN (thunks))
6641 dump_thunk (stream, indent + 2, thunks);
6644 /* Dump the thunks for FN. */
6647 debug_thunks (tree fn)
6649 dump_thunk (stderr, 0, fn);
6652 /* Virtual function table initialization. */
6654 /* Create all the necessary vtables for T and its base classes. */
6657 finish_vtbls (tree t)
6662 /* We lay out the primary and secondary vtables in one contiguous
6663 vtable. The primary vtable is first, followed by the non-virtual
6664 secondary vtables in inheritance graph order. */
6665 list = build_tree_list (BINFO_VTABLE (TYPE_BINFO (t)), NULL_TREE);
6666 accumulate_vtbl_inits (TYPE_BINFO (t), TYPE_BINFO (t),
6667 TYPE_BINFO (t), t, list);
6669 /* Then come the virtual bases, also in inheritance graph order. */
6670 for (vbase = TYPE_BINFO (t); vbase; vbase = TREE_CHAIN (vbase))
6672 if (!BINFO_VIRTUAL_P (vbase))
6674 accumulate_vtbl_inits (vbase, vbase, TYPE_BINFO (t), t, list);
6677 if (BINFO_VTABLE (TYPE_BINFO (t)))
6678 initialize_vtable (TYPE_BINFO (t), TREE_VALUE (list));
6681 /* Initialize the vtable for BINFO with the INITS. */
6684 initialize_vtable (tree binfo, tree inits)
6688 layout_vtable_decl (binfo, list_length (inits));
6689 decl = get_vtbl_decl_for_binfo (binfo);
6690 initialize_artificial_var (decl, inits);
6691 dump_vtable (BINFO_TYPE (binfo), binfo, decl);
6694 /* Build the VTT (virtual table table) for T.
6695 A class requires a VTT if it has virtual bases.
6698 1 - primary virtual pointer for complete object T
6699 2 - secondary VTTs for each direct non-virtual base of T which requires a
6701 3 - secondary virtual pointers for each direct or indirect base of T which
6702 has virtual bases or is reachable via a virtual path from T.
6703 4 - secondary VTTs for each direct or indirect virtual base of T.
6705 Secondary VTTs look like complete object VTTs without part 4. */
6715 /* Build up the initializers for the VTT. */
6717 index = size_zero_node;
6718 build_vtt_inits (TYPE_BINFO (t), t, &inits, &index);
6720 /* If we didn't need a VTT, we're done. */
6724 /* Figure out the type of the VTT. */
6725 type = build_index_type (size_int (list_length (inits) - 1));
6726 type = build_cplus_array_type (const_ptr_type_node, type);
6728 /* Now, build the VTT object itself. */
6729 vtt = build_vtable (t, get_vtt_name (t), type);
6730 initialize_artificial_var (vtt, inits);
6731 /* Add the VTT to the vtables list. */
6732 TREE_CHAIN (vtt) = TREE_CHAIN (CLASSTYPE_VTABLES (t));
6733 TREE_CHAIN (CLASSTYPE_VTABLES (t)) = vtt;
6738 /* When building a secondary VTT, BINFO_VTABLE is set to a TREE_LIST with
6739 PURPOSE the RTTI_BINFO, VALUE the real vtable pointer for this binfo,
6740 and CHAIN the vtable pointer for this binfo after construction is
6741 complete. VALUE can also be another BINFO, in which case we recurse. */
6744 binfo_ctor_vtable (tree binfo)
6750 vt = BINFO_VTABLE (binfo);
6751 if (TREE_CODE (vt) == TREE_LIST)
6752 vt = TREE_VALUE (vt);
6753 if (TREE_CODE (vt) == TREE_BINFO)
6762 /* Data for secondary VTT initialization. */
6763 typedef struct secondary_vptr_vtt_init_data_s
6765 /* Is this the primary VTT? */
6768 /* Current index into the VTT. */
6771 /* TREE_LIST of initializers built up. */
6774 /* The type being constructed by this secondary VTT. */
6775 tree type_being_constructed;
6776 } secondary_vptr_vtt_init_data;
6778 /* Recursively build the VTT-initializer for BINFO (which is in the
6779 hierarchy dominated by T). INITS points to the end of the initializer
6780 list to date. INDEX is the VTT index where the next element will be
6781 replaced. Iff BINFO is the binfo for T, this is the top level VTT (i.e.
6782 not a subvtt for some base of T). When that is so, we emit the sub-VTTs
6783 for virtual bases of T. When it is not so, we build the constructor
6784 vtables for the BINFO-in-T variant. */
6787 build_vtt_inits (tree binfo, tree t, tree *inits, tree *index)
6792 tree secondary_vptrs;
6793 secondary_vptr_vtt_init_data data;
6794 int top_level_p = SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), t);
6796 /* We only need VTTs for subobjects with virtual bases. */
6797 if (!CLASSTYPE_VBASECLASSES (BINFO_TYPE (binfo)))
6800 /* We need to use a construction vtable if this is not the primary
6804 build_ctor_vtbl_group (binfo, t);
6806 /* Record the offset in the VTT where this sub-VTT can be found. */
6807 BINFO_SUBVTT_INDEX (binfo) = *index;
6810 /* Add the address of the primary vtable for the complete object. */
6811 init = binfo_ctor_vtable (binfo);
6812 *inits = build_tree_list (NULL_TREE, init);
6813 inits = &TREE_CHAIN (*inits);
6816 gcc_assert (!BINFO_VPTR_INDEX (binfo));
6817 BINFO_VPTR_INDEX (binfo) = *index;
6819 *index = size_binop (PLUS_EXPR, *index, TYPE_SIZE_UNIT (ptr_type_node));
6821 /* Recursively add the secondary VTTs for non-virtual bases. */
6822 for (i = 0; BINFO_BASE_ITERATE (binfo, i, b); ++i)
6823 if (!BINFO_VIRTUAL_P (b))
6824 inits = build_vtt_inits (b, t, inits, index);
6826 /* Add secondary virtual pointers for all subobjects of BINFO with
6827 either virtual bases or reachable along a virtual path, except
6828 subobjects that are non-virtual primary bases. */
6829 data.top_level_p = top_level_p;
6830 data.index = *index;
6832 data.type_being_constructed = BINFO_TYPE (binfo);
6834 dfs_walk_once (binfo, dfs_build_secondary_vptr_vtt_inits, NULL, &data);
6836 *index = data.index;
6838 /* The secondary vptrs come back in reverse order. After we reverse
6839 them, and add the INITS, the last init will be the first element
6841 secondary_vptrs = data.inits;
6842 if (secondary_vptrs)
6844 *inits = nreverse (secondary_vptrs);
6845 inits = &TREE_CHAIN (secondary_vptrs);
6846 gcc_assert (*inits == NULL_TREE);
6850 /* Add the secondary VTTs for virtual bases in inheritance graph
6852 for (b = TYPE_BINFO (BINFO_TYPE (binfo)); b; b = TREE_CHAIN (b))
6854 if (!BINFO_VIRTUAL_P (b))
6857 inits = build_vtt_inits (b, t, inits, index);
6860 /* Remove the ctor vtables we created. */
6861 dfs_walk_all (binfo, dfs_fixup_binfo_vtbls, NULL, binfo);
6866 /* Called from build_vtt_inits via dfs_walk. BINFO is the binfo for the base
6867 in most derived. DATA is a SECONDARY_VPTR_VTT_INIT_DATA structure. */
6870 dfs_build_secondary_vptr_vtt_inits (tree binfo, void *data_)
6872 secondary_vptr_vtt_init_data *data = (secondary_vptr_vtt_init_data *)data_;
6874 /* We don't care about bases that don't have vtables. */
6875 if (!TYPE_VFIELD (BINFO_TYPE (binfo)))
6876 return dfs_skip_bases;
6878 /* We're only interested in proper subobjects of the type being
6880 if (SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), data->type_being_constructed))
6883 /* We're only interested in bases with virtual bases or reachable
6884 via a virtual path from the type being constructed. */
6885 if (!(CLASSTYPE_VBASECLASSES (BINFO_TYPE (binfo))
6886 || binfo_via_virtual (binfo, data->type_being_constructed)))
6887 return dfs_skip_bases;
6889 /* We're not interested in non-virtual primary bases. */
6890 if (!BINFO_VIRTUAL_P (binfo) && BINFO_PRIMARY_P (binfo))
6893 /* Record the index where this secondary vptr can be found. */
6894 if (data->top_level_p)
6896 gcc_assert (!BINFO_VPTR_INDEX (binfo));
6897 BINFO_VPTR_INDEX (binfo) = data->index;
6899 if (BINFO_VIRTUAL_P (binfo))
6901 /* It's a primary virtual base, and this is not a
6902 construction vtable. Find the base this is primary of in
6903 the inheritance graph, and use that base's vtable
6905 while (BINFO_PRIMARY_P (binfo))
6906 binfo = BINFO_INHERITANCE_CHAIN (binfo);
6910 /* Add the initializer for the secondary vptr itself. */
6911 data->inits = tree_cons (NULL_TREE, binfo_ctor_vtable (binfo), data->inits);
6913 /* Advance the vtt index. */
6914 data->index = size_binop (PLUS_EXPR, data->index,
6915 TYPE_SIZE_UNIT (ptr_type_node));
6920 /* Called from build_vtt_inits via dfs_walk. After building
6921 constructor vtables and generating the sub-vtt from them, we need
6922 to restore the BINFO_VTABLES that were scribbled on. DATA is the
6923 binfo of the base whose sub vtt was generated. */
6926 dfs_fixup_binfo_vtbls (tree binfo, void* data)
6928 tree vtable = BINFO_VTABLE (binfo);
6930 if (!TYPE_CONTAINS_VPTR_P (BINFO_TYPE (binfo)))
6931 /* If this class has no vtable, none of its bases do. */
6932 return dfs_skip_bases;
6935 /* This might be a primary base, so have no vtable in this
6939 /* If we scribbled the construction vtable vptr into BINFO, clear it
6941 if (TREE_CODE (vtable) == TREE_LIST
6942 && (TREE_PURPOSE (vtable) == (tree) data))
6943 BINFO_VTABLE (binfo) = TREE_CHAIN (vtable);
6948 /* Build the construction vtable group for BINFO which is in the
6949 hierarchy dominated by T. */
6952 build_ctor_vtbl_group (tree binfo, tree t)
6961 /* See if we've already created this construction vtable group. */
6962 id = mangle_ctor_vtbl_for_type (t, binfo);
6963 if (IDENTIFIER_GLOBAL_VALUE (id))
6966 gcc_assert (!SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), t));
6967 /* Build a version of VTBL (with the wrong type) for use in
6968 constructing the addresses of secondary vtables in the
6969 construction vtable group. */
6970 vtbl = build_vtable (t, id, ptr_type_node);
6971 DECL_CONSTRUCTION_VTABLE_P (vtbl) = 1;
6972 list = build_tree_list (vtbl, NULL_TREE);
6973 accumulate_vtbl_inits (binfo, TYPE_BINFO (TREE_TYPE (binfo)),
6976 /* Add the vtables for each of our virtual bases using the vbase in T
6978 for (vbase = TYPE_BINFO (BINFO_TYPE (binfo));
6980 vbase = TREE_CHAIN (vbase))
6984 if (!BINFO_VIRTUAL_P (vbase))
6986 b = copied_binfo (vbase, binfo);
6988 accumulate_vtbl_inits (b, vbase, binfo, t, list);
6990 inits = TREE_VALUE (list);
6992 /* Figure out the type of the construction vtable. */
6993 type = build_index_type (size_int (list_length (inits) - 1));
6994 type = build_cplus_array_type (vtable_entry_type, type);
6995 TREE_TYPE (vtbl) = type;
6997 /* Initialize the construction vtable. */
6998 CLASSTYPE_VTABLES (t) = chainon (CLASSTYPE_VTABLES (t), vtbl);
6999 initialize_artificial_var (vtbl, inits);
7000 dump_vtable (t, binfo, vtbl);
7003 /* Add the vtbl initializers for BINFO (and its bases other than
7004 non-virtual primaries) to the list of INITS. BINFO is in the
7005 hierarchy dominated by T. RTTI_BINFO is the binfo within T of
7006 the constructor the vtbl inits should be accumulated for. (If this
7007 is the complete object vtbl then RTTI_BINFO will be TYPE_BINFO (T).)
7008 ORIG_BINFO is the binfo for this object within BINFO_TYPE (RTTI_BINFO).
7009 BINFO is the active base equivalent of ORIG_BINFO in the inheritance
7010 graph of T. Both BINFO and ORIG_BINFO will have the same BINFO_TYPE,
7011 but are not necessarily the same in terms of layout. */
7014 accumulate_vtbl_inits (tree binfo,
7022 int ctor_vtbl_p = !SAME_BINFO_TYPE_P (BINFO_TYPE (rtti_binfo), t);
7024 gcc_assert (SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), BINFO_TYPE (orig_binfo)));
7026 /* If it doesn't have a vptr, we don't do anything. */
7027 if (!TYPE_CONTAINS_VPTR_P (BINFO_TYPE (binfo)))
7030 /* If we're building a construction vtable, we're not interested in
7031 subobjects that don't require construction vtables. */
7033 && !CLASSTYPE_VBASECLASSES (BINFO_TYPE (binfo))
7034 && !binfo_via_virtual (orig_binfo, BINFO_TYPE (rtti_binfo)))
7037 /* Build the initializers for the BINFO-in-T vtable. */
7039 = chainon (TREE_VALUE (inits),
7040 dfs_accumulate_vtbl_inits (binfo, orig_binfo,
7041 rtti_binfo, t, inits));
7043 /* Walk the BINFO and its bases. We walk in preorder so that as we
7044 initialize each vtable we can figure out at what offset the
7045 secondary vtable lies from the primary vtable. We can't use
7046 dfs_walk here because we need to iterate through bases of BINFO
7047 and RTTI_BINFO simultaneously. */
7048 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i)
7050 /* Skip virtual bases. */
7051 if (BINFO_VIRTUAL_P (base_binfo))
7053 accumulate_vtbl_inits (base_binfo,
7054 BINFO_BASE_BINFO (orig_binfo, i),
7060 /* Called from accumulate_vtbl_inits. Returns the initializers for
7061 the BINFO vtable. */
7064 dfs_accumulate_vtbl_inits (tree binfo,
7070 tree inits = NULL_TREE;
7071 tree vtbl = NULL_TREE;
7072 int ctor_vtbl_p = !SAME_BINFO_TYPE_P (BINFO_TYPE (rtti_binfo), t);
7075 && BINFO_VIRTUAL_P (orig_binfo) && BINFO_PRIMARY_P (orig_binfo))
7077 /* In the hierarchy of BINFO_TYPE (RTTI_BINFO), this is a
7078 primary virtual base. If it is not the same primary in
7079 the hierarchy of T, we'll need to generate a ctor vtable
7080 for it, to place at its location in T. If it is the same
7081 primary, we still need a VTT entry for the vtable, but it
7082 should point to the ctor vtable for the base it is a
7083 primary for within the sub-hierarchy of RTTI_BINFO.
7085 There are three possible cases:
7087 1) We are in the same place.
7088 2) We are a primary base within a lost primary virtual base of
7090 3) We are primary to something not a base of RTTI_BINFO. */
7093 tree last = NULL_TREE;
7095 /* First, look through the bases we are primary to for RTTI_BINFO
7096 or a virtual base. */
7098 while (BINFO_PRIMARY_P (b))
7100 b = BINFO_INHERITANCE_CHAIN (b);
7102 if (BINFO_VIRTUAL_P (b) || b == rtti_binfo)
7105 /* If we run out of primary links, keep looking down our
7106 inheritance chain; we might be an indirect primary. */
7107 for (b = last; b; b = BINFO_INHERITANCE_CHAIN (b))
7108 if (BINFO_VIRTUAL_P (b) || b == rtti_binfo)
7112 /* If we found RTTI_BINFO, this is case 1. If we found a virtual
7113 base B and it is a base of RTTI_BINFO, this is case 2. In
7114 either case, we share our vtable with LAST, i.e. the
7115 derived-most base within B of which we are a primary. */
7117 || (b && binfo_for_vbase (BINFO_TYPE (b), BINFO_TYPE (rtti_binfo))))
7118 /* Just set our BINFO_VTABLE to point to LAST, as we may not have
7119 set LAST's BINFO_VTABLE yet. We'll extract the actual vptr in
7120 binfo_ctor_vtable after everything's been set up. */
7123 /* Otherwise, this is case 3 and we get our own. */
7125 else if (!BINFO_NEW_VTABLE_MARKED (orig_binfo))
7133 /* Compute the initializer for this vtable. */
7134 inits = build_vtbl_initializer (binfo, orig_binfo, t, rtti_binfo,
7137 /* Figure out the position to which the VPTR should point. */
7138 vtbl = TREE_PURPOSE (l);
7139 vtbl = build1 (ADDR_EXPR, vtbl_ptr_type_node, vtbl);
7140 index = size_binop (PLUS_EXPR,
7141 size_int (non_fn_entries),
7142 size_int (list_length (TREE_VALUE (l))));
7143 index = size_binop (MULT_EXPR,
7144 TYPE_SIZE_UNIT (vtable_entry_type),
7146 vtbl = build2 (PLUS_EXPR, TREE_TYPE (vtbl), vtbl, index);
7150 /* For a construction vtable, we can't overwrite BINFO_VTABLE.
7151 So, we make a TREE_LIST. Later, dfs_fixup_binfo_vtbls will
7152 straighten this out. */
7153 BINFO_VTABLE (binfo) = tree_cons (rtti_binfo, vtbl, BINFO_VTABLE (binfo));
7154 else if (BINFO_PRIMARY_P (binfo) && BINFO_VIRTUAL_P (binfo))
7157 /* For an ordinary vtable, set BINFO_VTABLE. */
7158 BINFO_VTABLE (binfo) = vtbl;
7163 static GTY(()) tree abort_fndecl_addr;
7165 /* Construct the initializer for BINFO's virtual function table. BINFO
7166 is part of the hierarchy dominated by T. If we're building a
7167 construction vtable, the ORIG_BINFO is the binfo we should use to
7168 find the actual function pointers to put in the vtable - but they
7169 can be overridden on the path to most-derived in the graph that
7170 ORIG_BINFO belongs. Otherwise,
7171 ORIG_BINFO should be the same as BINFO. The RTTI_BINFO is the
7172 BINFO that should be indicated by the RTTI information in the
7173 vtable; it will be a base class of T, rather than T itself, if we
7174 are building a construction vtable.
7176 The value returned is a TREE_LIST suitable for wrapping in a
7177 CONSTRUCTOR to use as the DECL_INITIAL for a vtable. If
7178 NON_FN_ENTRIES_P is not NULL, *NON_FN_ENTRIES_P is set to the
7179 number of non-function entries in the vtable.
7181 It might seem that this function should never be called with a
7182 BINFO for which BINFO_PRIMARY_P holds, the vtable for such a
7183 base is always subsumed by a derived class vtable. However, when
7184 we are building construction vtables, we do build vtables for
7185 primary bases; we need these while the primary base is being
7189 build_vtbl_initializer (tree binfo,
7193 int* non_fn_entries_p)
7200 VEC(tree,gc) *vbases;
7202 /* Initialize VID. */
7203 memset (&vid, 0, sizeof (vid));
7206 vid.rtti_binfo = rtti_binfo;
7207 vid.last_init = &vid.inits;
7208 vid.primary_vtbl_p = SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), t);
7209 vid.ctor_vtbl_p = !SAME_BINFO_TYPE_P (BINFO_TYPE (rtti_binfo), t);
7210 vid.generate_vcall_entries = true;
7211 /* The first vbase or vcall offset is at index -3 in the vtable. */
7212 vid.index = ssize_int(-3 * TARGET_VTABLE_DATA_ENTRY_DISTANCE);
7214 /* Add entries to the vtable for RTTI. */
7215 build_rtti_vtbl_entries (binfo, &vid);
7217 /* Create an array for keeping track of the functions we've
7218 processed. When we see multiple functions with the same
7219 signature, we share the vcall offsets. */
7220 vid.fns = VEC_alloc (tree, gc, 32);
7221 /* Add the vcall and vbase offset entries. */
7222 build_vcall_and_vbase_vtbl_entries (binfo, &vid);
7224 /* Clear BINFO_VTABLE_PATH_MARKED; it's set by
7225 build_vbase_offset_vtbl_entries. */
7226 for (vbases = CLASSTYPE_VBASECLASSES (t), ix = 0;
7227 VEC_iterate (tree, vbases, ix, vbinfo); ix++)
7228 BINFO_VTABLE_PATH_MARKED (vbinfo) = 0;
7230 /* If the target requires padding between data entries, add that now. */
7231 if (TARGET_VTABLE_DATA_ENTRY_DISTANCE > 1)
7235 for (prev = &vid.inits; (cur = *prev); prev = &TREE_CHAIN (cur))
7240 for (i = 1; i < TARGET_VTABLE_DATA_ENTRY_DISTANCE; ++i)
7241 add = tree_cons (NULL_TREE,
7242 build1 (NOP_EXPR, vtable_entry_type,
7249 if (non_fn_entries_p)
7250 *non_fn_entries_p = list_length (vid.inits);
7252 /* Go through all the ordinary virtual functions, building up
7254 vfun_inits = NULL_TREE;
7255 for (v = BINFO_VIRTUALS (orig_binfo); v; v = TREE_CHAIN (v))
7259 tree fn, fn_original;
7260 tree init = NULL_TREE;
7264 if (DECL_THUNK_P (fn))
7266 if (!DECL_NAME (fn))
7268 if (THUNK_ALIAS (fn))
7270 fn = THUNK_ALIAS (fn);
7273 fn_original = THUNK_TARGET (fn);
7276 /* If the only definition of this function signature along our
7277 primary base chain is from a lost primary, this vtable slot will
7278 never be used, so just zero it out. This is important to avoid
7279 requiring extra thunks which cannot be generated with the function.
7281 We first check this in update_vtable_entry_for_fn, so we handle
7282 restored primary bases properly; we also need to do it here so we
7283 zero out unused slots in ctor vtables, rather than filling themff
7284 with erroneous values (though harmless, apart from relocation
7286 for (b = binfo; ; b = get_primary_binfo (b))
7288 /* We found a defn before a lost primary; go ahead as normal. */
7289 if (look_for_overrides_here (BINFO_TYPE (b), fn_original))
7292 /* The nearest definition is from a lost primary; clear the
7294 if (BINFO_LOST_PRIMARY_P (b))
7296 init = size_zero_node;
7303 /* Pull the offset for `this', and the function to call, out of
7305 delta = BV_DELTA (v);
7306 vcall_index = BV_VCALL_INDEX (v);
7308 gcc_assert (TREE_CODE (delta) == INTEGER_CST);
7309 gcc_assert (TREE_CODE (fn) == FUNCTION_DECL);
7311 /* You can't call an abstract virtual function; it's abstract.
7312 So, we replace these functions with __pure_virtual. */
7313 if (DECL_PURE_VIRTUAL_P (fn_original))
7316 if (abort_fndecl_addr == NULL)
7317 abort_fndecl_addr = build1 (ADDR_EXPR, vfunc_ptr_type_node, fn);
7318 init = abort_fndecl_addr;
7322 if (!integer_zerop (delta) || vcall_index)
7324 fn = make_thunk (fn, /*this_adjusting=*/1, delta, vcall_index);
7325 if (!DECL_NAME (fn))
7328 /* Take the address of the function, considering it to be of an
7329 appropriate generic type. */
7330 init = build1 (ADDR_EXPR, vfunc_ptr_type_node, fn);
7334 /* And add it to the chain of initializers. */
7335 if (TARGET_VTABLE_USES_DESCRIPTORS)
7338 if (init == size_zero_node)
7339 for (i = 0; i < TARGET_VTABLE_USES_DESCRIPTORS; ++i)
7340 vfun_inits = tree_cons (NULL_TREE, init, vfun_inits);
7342 for (i = 0; i < TARGET_VTABLE_USES_DESCRIPTORS; ++i)
7344 tree fdesc = build2 (FDESC_EXPR, vfunc_ptr_type_node,
7345 TREE_OPERAND (init, 0),
7346 build_int_cst (NULL_TREE, i));
7347 TREE_CONSTANT (fdesc) = 1;
7348 TREE_INVARIANT (fdesc) = 1;
7350 vfun_inits = tree_cons (NULL_TREE, fdesc, vfun_inits);
7354 vfun_inits = tree_cons (NULL_TREE, init, vfun_inits);
7357 /* The initializers for virtual functions were built up in reverse
7358 order; straighten them out now. */
7359 vfun_inits = nreverse (vfun_inits);
7361 /* The negative offset initializers are also in reverse order. */
7362 vid.inits = nreverse (vid.inits);
7364 /* Chain the two together. */
7365 return chainon (vid.inits, vfun_inits);
7368 /* Adds to vid->inits the initializers for the vbase and vcall
7369 offsets in BINFO, which is in the hierarchy dominated by T. */
7372 build_vcall_and_vbase_vtbl_entries (tree binfo, vtbl_init_data* vid)
7376 /* If this is a derived class, we must first create entries
7377 corresponding to the primary base class. */
7378 b = get_primary_binfo (binfo);
7380 build_vcall_and_vbase_vtbl_entries (b, vid);
7382 /* Add the vbase entries for this base. */
7383 build_vbase_offset_vtbl_entries (binfo, vid);
7384 /* Add the vcall entries for this base. */
7385 build_vcall_offset_vtbl_entries (binfo, vid);
7388 /* Returns the initializers for the vbase offset entries in the vtable
7389 for BINFO (which is part of the class hierarchy dominated by T), in
7390 reverse order. VBASE_OFFSET_INDEX gives the vtable index
7391 where the next vbase offset will go. */
7394 build_vbase_offset_vtbl_entries (tree binfo, vtbl_init_data* vid)
7398 tree non_primary_binfo;
7400 /* If there are no virtual baseclasses, then there is nothing to
7402 if (!CLASSTYPE_VBASECLASSES (BINFO_TYPE (binfo)))
7407 /* We might be a primary base class. Go up the inheritance hierarchy
7408 until we find the most derived class of which we are a primary base:
7409 it is the offset of that which we need to use. */
7410 non_primary_binfo = binfo;
7411 while (BINFO_INHERITANCE_CHAIN (non_primary_binfo))
7415 /* If we have reached a virtual base, then it must be a primary
7416 base (possibly multi-level) of vid->binfo, or we wouldn't
7417 have called build_vcall_and_vbase_vtbl_entries for it. But it
7418 might be a lost primary, so just skip down to vid->binfo. */
7419 if (BINFO_VIRTUAL_P (non_primary_binfo))
7421 non_primary_binfo = vid->binfo;
7425 b = BINFO_INHERITANCE_CHAIN (non_primary_binfo);
7426 if (get_primary_binfo (b) != non_primary_binfo)
7428 non_primary_binfo = b;
7431 /* Go through the virtual bases, adding the offsets. */
7432 for (vbase = TYPE_BINFO (BINFO_TYPE (binfo));
7434 vbase = TREE_CHAIN (vbase))
7439 if (!BINFO_VIRTUAL_P (vbase))
7442 /* Find the instance of this virtual base in the complete
7444 b = copied_binfo (vbase, binfo);
7446 /* If we've already got an offset for this virtual base, we
7447 don't need another one. */
7448 if (BINFO_VTABLE_PATH_MARKED (b))
7450 BINFO_VTABLE_PATH_MARKED (b) = 1;
7452 /* Figure out where we can find this vbase offset. */
7453 delta = size_binop (MULT_EXPR,
7456 TYPE_SIZE_UNIT (vtable_entry_type)));
7457 if (vid->primary_vtbl_p)
7458 BINFO_VPTR_FIELD (b) = delta;
7460 if (binfo != TYPE_BINFO (t))
7461 /* The vbase offset had better be the same. */
7462 gcc_assert (tree_int_cst_equal (delta, BINFO_VPTR_FIELD (vbase)));
7464 /* The next vbase will come at a more negative offset. */
7465 vid->index = size_binop (MINUS_EXPR, vid->index,
7466 ssize_int (TARGET_VTABLE_DATA_ENTRY_DISTANCE));
7468 /* The initializer is the delta from BINFO to this virtual base.
7469 The vbase offsets go in reverse inheritance-graph order, and
7470 we are walking in inheritance graph order so these end up in
7472 delta = size_diffop (BINFO_OFFSET (b), BINFO_OFFSET (non_primary_binfo));
7475 = build_tree_list (NULL_TREE,
7476 fold_build1 (NOP_EXPR,
7479 vid->last_init = &TREE_CHAIN (*vid->last_init);
7483 /* Adds the initializers for the vcall offset entries in the vtable
7484 for BINFO (which is part of the class hierarchy dominated by VID->DERIVED)
7488 build_vcall_offset_vtbl_entries (tree binfo, vtbl_init_data* vid)
7490 /* We only need these entries if this base is a virtual base. We
7491 compute the indices -- but do not add to the vtable -- when
7492 building the main vtable for a class. */
7493 if (BINFO_VIRTUAL_P (binfo) || binfo == TYPE_BINFO (vid->derived))
7495 /* We need a vcall offset for each of the virtual functions in this
7496 vtable. For example:
7498 class A { virtual void f (); };
7499 class B1 : virtual public A { virtual void f (); };
7500 class B2 : virtual public A { virtual void f (); };
7501 class C: public B1, public B2 { virtual void f (); };
7503 A C object has a primary base of B1, which has a primary base of A. A
7504 C also has a secondary base of B2, which no longer has a primary base
7505 of A. So the B2-in-C construction vtable needs a secondary vtable for
7506 A, which will adjust the A* to a B2* to call f. We have no way of
7507 knowing what (or even whether) this offset will be when we define B2,
7508 so we store this "vcall offset" in the A sub-vtable and look it up in
7509 a "virtual thunk" for B2::f.
7511 We need entries for all the functions in our primary vtable and
7512 in our non-virtual bases' secondary vtables. */
7514 /* If we are just computing the vcall indices -- but do not need
7515 the actual entries -- not that. */
7516 if (!BINFO_VIRTUAL_P (binfo))
7517 vid->generate_vcall_entries = false;
7518 /* Now, walk through the non-virtual bases, adding vcall offsets. */
7519 add_vcall_offset_vtbl_entries_r (binfo, vid);
7523 /* Build vcall offsets, starting with those for BINFO. */
7526 add_vcall_offset_vtbl_entries_r (tree binfo, vtbl_init_data* vid)
7532 /* Don't walk into virtual bases -- except, of course, for the
7533 virtual base for which we are building vcall offsets. Any
7534 primary virtual base will have already had its offsets generated
7535 through the recursion in build_vcall_and_vbase_vtbl_entries. */
7536 if (BINFO_VIRTUAL_P (binfo) && vid->vbase != binfo)
7539 /* If BINFO has a primary base, process it first. */
7540 primary_binfo = get_primary_binfo (binfo);
7542 add_vcall_offset_vtbl_entries_r (primary_binfo, vid);
7544 /* Add BINFO itself to the list. */
7545 add_vcall_offset_vtbl_entries_1 (binfo, vid);
7547 /* Scan the non-primary bases of BINFO. */
7548 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i)
7549 if (base_binfo != primary_binfo)
7550 add_vcall_offset_vtbl_entries_r (base_binfo, vid);
7553 /* Called from build_vcall_offset_vtbl_entries_r. */
7556 add_vcall_offset_vtbl_entries_1 (tree binfo, vtbl_init_data* vid)
7558 /* Make entries for the rest of the virtuals. */
7559 if (abi_version_at_least (2))
7563 /* The ABI requires that the methods be processed in declaration
7564 order. G++ 3.2 used the order in the vtable. */
7565 for (orig_fn = TYPE_METHODS (BINFO_TYPE (binfo));
7567 orig_fn = TREE_CHAIN (orig_fn))
7568 if (DECL_VINDEX (orig_fn))
7569 add_vcall_offset (orig_fn, binfo, vid);
7573 tree derived_virtuals;
7576 /* If BINFO is a primary base, the most derived class which has
7577 BINFO as a primary base; otherwise, just BINFO. */
7578 tree non_primary_binfo;
7580 /* We might be a primary base class. Go up the inheritance hierarchy
7581 until we find the most derived class of which we are a primary base:
7582 it is the BINFO_VIRTUALS there that we need to consider. */
7583 non_primary_binfo = binfo;
7584 while (BINFO_INHERITANCE_CHAIN (non_primary_binfo))
7588 /* If we have reached a virtual base, then it must be vid->vbase,
7589 because we ignore other virtual bases in
7590 add_vcall_offset_vtbl_entries_r. In turn, it must be a primary
7591 base (possibly multi-level) of vid->binfo, or we wouldn't
7592 have called build_vcall_and_vbase_vtbl_entries for it. But it
7593 might be a lost primary, so just skip down to vid->binfo. */
7594 if (BINFO_VIRTUAL_P (non_primary_binfo))
7596 gcc_assert (non_primary_binfo == vid->vbase);
7597 non_primary_binfo = vid->binfo;
7601 b = BINFO_INHERITANCE_CHAIN (non_primary_binfo);
7602 if (get_primary_binfo (b) != non_primary_binfo)
7604 non_primary_binfo = b;
7607 if (vid->ctor_vtbl_p)
7608 /* For a ctor vtable we need the equivalent binfo within the hierarchy
7609 where rtti_binfo is the most derived type. */
7611 = original_binfo (non_primary_binfo, vid->rtti_binfo);
7613 for (base_virtuals = BINFO_VIRTUALS (binfo),
7614 derived_virtuals = BINFO_VIRTUALS (non_primary_binfo),
7615 orig_virtuals = BINFO_VIRTUALS (TYPE_BINFO (BINFO_TYPE (binfo)));
7617 base_virtuals = TREE_CHAIN (base_virtuals),
7618 derived_virtuals = TREE_CHAIN (derived_virtuals),
7619 orig_virtuals = TREE_CHAIN (orig_virtuals))
7623 /* Find the declaration that originally caused this function to
7624 be present in BINFO_TYPE (binfo). */
7625 orig_fn = BV_FN (orig_virtuals);
7627 /* When processing BINFO, we only want to generate vcall slots for
7628 function slots introduced in BINFO. So don't try to generate
7629 one if the function isn't even defined in BINFO. */
7630 if (!SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), DECL_CONTEXT (orig_fn)))
7633 add_vcall_offset (orig_fn, binfo, vid);
7638 /* Add a vcall offset entry for ORIG_FN to the vtable. */
7641 add_vcall_offset (tree orig_fn, tree binfo, vtbl_init_data *vid)
7647 /* If there is already an entry for a function with the same
7648 signature as FN, then we do not need a second vcall offset.
7649 Check the list of functions already present in the derived
7651 for (i = 0; VEC_iterate (tree, vid->fns, i, derived_entry); ++i)
7653 if (same_signature_p (derived_entry, orig_fn)
7654 /* We only use one vcall offset for virtual destructors,
7655 even though there are two virtual table entries. */
7656 || (DECL_DESTRUCTOR_P (derived_entry)
7657 && DECL_DESTRUCTOR_P (orig_fn)))
7661 /* If we are building these vcall offsets as part of building
7662 the vtable for the most derived class, remember the vcall
7664 if (vid->binfo == TYPE_BINFO (vid->derived))
7666 tree_pair_p elt = VEC_safe_push (tree_pair_s, gc,
7667 CLASSTYPE_VCALL_INDICES (vid->derived),
7669 elt->purpose = orig_fn;
7670 elt->value = vid->index;
7673 /* The next vcall offset will be found at a more negative
7675 vid->index = size_binop (MINUS_EXPR, vid->index,
7676 ssize_int (TARGET_VTABLE_DATA_ENTRY_DISTANCE));
7678 /* Keep track of this function. */
7679 VEC_safe_push (tree, gc, vid->fns, orig_fn);
7681 if (vid->generate_vcall_entries)
7686 /* Find the overriding function. */
7687 fn = find_final_overrider (vid->rtti_binfo, binfo, orig_fn);
7688 if (fn == error_mark_node)
7689 vcall_offset = build1 (NOP_EXPR, vtable_entry_type,
7693 base = TREE_VALUE (fn);
7695 /* The vbase we're working on is a primary base of
7696 vid->binfo. But it might be a lost primary, so its
7697 BINFO_OFFSET might be wrong, so we just use the
7698 BINFO_OFFSET from vid->binfo. */
7699 vcall_offset = size_diffop (BINFO_OFFSET (base),
7700 BINFO_OFFSET (vid->binfo));
7701 vcall_offset = fold_build1 (NOP_EXPR, vtable_entry_type,
7704 /* Add the initializer to the vtable. */
7705 *vid->last_init = build_tree_list (NULL_TREE, vcall_offset);
7706 vid->last_init = &TREE_CHAIN (*vid->last_init);
7710 /* Return vtbl initializers for the RTTI entries corresponding to the
7711 BINFO's vtable. The RTTI entries should indicate the object given
7712 by VID->rtti_binfo. */
7715 build_rtti_vtbl_entries (tree binfo, vtbl_init_data* vid)
7724 basetype = BINFO_TYPE (binfo);
7725 t = BINFO_TYPE (vid->rtti_binfo);
7727 /* To find the complete object, we will first convert to our most
7728 primary base, and then add the offset in the vtbl to that value. */
7730 while (CLASSTYPE_HAS_PRIMARY_BASE_P (BINFO_TYPE (b))
7731 && !BINFO_LOST_PRIMARY_P (b))
7735 primary_base = get_primary_binfo (b);
7736 gcc_assert (BINFO_PRIMARY_P (primary_base)
7737 && BINFO_INHERITANCE_CHAIN (primary_base) == b);
7740 offset = size_diffop (BINFO_OFFSET (vid->rtti_binfo), BINFO_OFFSET (b));
7742 /* The second entry is the address of the typeinfo object. */
7744 decl = build_address (get_tinfo_decl (t));
7746 decl = integer_zero_node;
7748 /* Convert the declaration to a type that can be stored in the
7750 init = build_nop (vfunc_ptr_type_node, decl);
7751 *vid->last_init = build_tree_list (NULL_TREE, init);
7752 vid->last_init = &TREE_CHAIN (*vid->last_init);
7754 /* Add the offset-to-top entry. It comes earlier in the vtable than
7755 the typeinfo entry. Convert the offset to look like a
7756 function pointer, so that we can put it in the vtable. */
7757 init = build_nop (vfunc_ptr_type_node, offset);
7758 *vid->last_init = build_tree_list (NULL_TREE, init);
7759 vid->last_init = &TREE_CHAIN (*vid->last_init);
7762 /* Fold a OBJ_TYPE_REF expression to the address of a function.
7763 KNOWN_TYPE carries the true type of OBJ_TYPE_REF_OBJECT(REF). */
7766 cp_fold_obj_type_ref (tree ref, tree known_type)
7768 HOST_WIDE_INT index = tree_low_cst (OBJ_TYPE_REF_TOKEN (ref), 1);
7769 HOST_WIDE_INT i = 0;
7770 tree v = BINFO_VIRTUALS (TYPE_BINFO (known_type));
7775 i += (TARGET_VTABLE_USES_DESCRIPTORS
7776 ? TARGET_VTABLE_USES_DESCRIPTORS : 1);
7782 #ifdef ENABLE_CHECKING
7783 gcc_assert (tree_int_cst_equal (OBJ_TYPE_REF_TOKEN (ref),
7784 DECL_VINDEX (fndecl)));
7787 cgraph_node (fndecl)->local.vtable_method = true;
7789 return build_address (fndecl);
7792 #include "gt-cp-class.h"